条件状语从句
条件状语从句
一、条件状语从句通常由if（如果）, unless（除非），as long as（只要）引
导。
eg：If it rains tomorrow, we won’t go to the park. 如果明天下雨，我们就不去公园了。
Unless weather stops me, I go for a walk every. 我每天都会去散步，除非遇上坏天气。
Our parents will be pleased with our performance as long as we try our best.
只要我们竭尽全力，父母就会满意我们的表现。
Our parents will be pleased with our performance _____ _____ ______ we try our best.
二、if引导的条件状语从句
eg：If you want to go, please let me know.
If the green light isn’t on, wait for a minute.
(2)“祈使句+ and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。
注意：A. “祈使句+ and + 陈述句”可以转化为if引导的肯定条件状语从句，而且主语是第二人称。
B. “祈使句+ or + 陈述句”可以转化为if引导的否定条件状语从句，而且主语是第二人称。
eg：Study hard and you will pass the exam. =If you study hard, you will pass the exam.
Hurry up, or you’ll be late. =If you don’t hurry up, you’ll be late.
考题Work hard，________ you may catch up with your classmates soon.
A.or
B.but
C.and
D.yet
用if连接下列句子
1、Go to bed early and you will have a good rest.
2、Hurry up, or you’ll miss the bus.
三、if从句与主句具有以下特点：
1．If从句中用一般现在时，表示未来的一种条件，从句中可以加时间状语。Eg:If you can’t come tomorrow, we can hold the party a little later.
If it doesn’t rain tomorrow, we’ll go to the Great Wall.
2．当if表示未来的条件时，主句中用一般将来时，从句用一般现在时，即“主将从现”。表示如果某种条件存在，就有可能/不可能发生什么事情。
eg.If you don’t get u p early, you will be late for school.
If I play games on it, it will go wrong.
3．if从句可放在主句前或主句后，从句置于主句前时，须用逗号与主句隔开，反之则不用逗号。
eg.If it’s fine tomorrow, we can go out.
She will be happy if she joins the party.
I’ll ask the teacher for help if I don’t understand.
三．注意if引导的条件状语从句和宾语从句的区别
if可以用来引导宾语从句也可以用来引导条件状语从句，主要是要弄清if引导从句的时态。if在引导宾语从句时，意为“是否”。要根据实际情况来确定时态，而if在引导条件状语从句时意为“如果，假设”，要用一般时代替将来时，即“主将从现”。
eg.I want to know if he will come here tomorrow.
（if在上句引导的是宾语从句，从句中有很明显的表将来的时间状语tomorrow，所以if从句要用一般将来时。）
eg.If it rains tomorrow, we’ll put off the sports meeting.
（if在上句引导的是条件状语从句，尽管从句中也有表将来时的时间状语tomorrow，从理论上讲也应该用一般将来时，但是在if引导的条件状语从句中要用一般现在时代替一般将来时，故从句谓语用rains而不用will rain. ）
二、典题分析
1、We will have no water to drink we don’t protect the earth.
A. until
B. before
C. though
D. if
2、We will plant trees tomorrow, and I don’t know Tom will come and join us.
A. if
B. which
C. what
D. where
3、—Do you know if finished the work?
—Not yet. If he , he will give me a call.
A. he’s, will finish
B. he’ll, finishes
C. he’s , finishes
D. he’ll , will finish
练习
用所给的提示词组成一个if引导的条件状语从句。
1、be tired, have a rest (Tom)
2、not go to bed early, feel sleepy (you)
3、become unhealthy, not eat vegetables (children)
4、not listen to the teacher, not study well (I )
5、fall behind others in studying, spend too much time on the games (Da
Wei)
三、单项选择：
1. You are sure to pass the exam ___ you study hard.
A. if
B. though
C. that
D. since
2. I'll go to see the film with you___I have time this evening.
A. whether
B. so
C. if
D. when
3. ___ you study harder, you'll never pass the final exam.
A. If
B. Until
C. Unless
D. Except
4．We’ll stay at home if it ______ this afternoon.
A．rain B．rains C．to rain D．raining
5．We will go to the Great Wall if it ______tomorrow.
A．won’t rain B．isn’t raining C．rained D．doesn’t rain 6．—I don’t know if he ______.
—He will come if it ______.
A．comes; won’t rain B．will come; doesn’t rain C．comes; doesn't rain D．will come; won’t rain
7．Do you know what time ______？
A．the train leave B．does the train leave
C．will the train leave D．the train leaves
8．Do you think if______ an English film tomorrow night？
A．is there B．there is going to have C．there is going to be D．will there be
9．Will you please tell me ______？
A．where Pudong Airport is
B．how far Pudong Airport was
C．how can we get to Pudong Airport
D．when was Pudong Airport built
10．—Mike wants to know if______ a picnic tomorrow.
—Yes. But if it ______, we’ll visit the museum instead.
A．you have; will rain B．you will have; will rain
C．you will have; rains D．will you have; rains
11．—Why didn’t Nick come to school yesterday？
—______ he was ill.
A．After B．Where C．When D．Because 12．This box is ______ heavy ______ I can’t carry it.
A．too; to B．so; that C．very; that D．too; that
13．I don’t know ______ he still lives here.
A．where B．what C．when D．whether
14. ---Do you know if he _______ to play basket ball with us?
---I think he will come if he ______ free tomorrow.
A. comes; is
B. comes; will be
C. will come; is
D. will come; will be
15. In the zoo if a child _____ into the water and can’t swim, the dolphins may come up ______ him.
A. will fall; to help
B. falls; to help
C. will fall; help
D. falls; helping
16.In the bookshop，a reader asked the shop keeper ___Who Moved My Cheese was an interesting book.
A.that
B.how
C.what
D.if
17、I want to know ________ you have a brother.
A.if
B.that
C.those
D.them
18、We will go hiking if it tomorrow.
A.will be fine
B.is fine
C.be fine
D. is gong to be fine
19、Maybe you if you make some bad friends.
A.go wrong
B. will go wrong
C.going wrong
D. is going to be wrong
20、—Do you know if finished the work?
—Not yet. If he , he will give me a call.
A. he’s, will finish
B. he’ll, finishes
C. he’s , finishes
D. he’ll , will finish
单选
1. Don’t forget______ your homework.
A. doing
B. to do
C. did
D. does
2. What about ______ at home?
A. staying
B. stay
C. to stay
D. stays
3. Our English teacher gave us ______ on how to learn English well.
A. an advice
B. some advice
C. some advices
D. many advice
4. Jack likes to ______ others but never writes to them.
A. hear
B. hear of
C. hear about
D. hear from
5. Some boys of Class 2 enjoy ______ music.
A. listen to
B. listens to
C. listening to
D. listened to
6. Did Mary enjoy ______ at the party?
A. her
B. himself
C. oneself
D. herself
7.. --Could you please _____ your watch to me?
--OK. Here you are.
A. show
B. to show
C. showing
D.shows
8. ---Do you still remember ______ me somewhere in Shanghai?
---Yes, of course. Two years ago.
A. to see
B. seeing
C. see
D. saw
9. ---I ______ it out in this way, but I failed.
---Why ______ it in another way?
A. tired to work; not try doing
B. tired to work; not try to do
C. tried working; not try to do
D. try to work; not try doing
10. How long does it ______ you to travel from Beijing to Shanghai?
A. call
B. take
C. make
D. use
一、配对阅读。
下表右栏是左栏句子的回答，请将表中对话配对
1. ______ 2______ 3. ______ 4. ______ 5. ______
四、完形填空
Qu Yuan was born in China around 2000 years ago. His job was to give some 1 to the king. The old king always took his advice. 2 the new king didn't like listening to Qu Yuan after the old king 3 . Qu Yuan finally 4 his job.
Qu Yuan was very 5 at writing poems(诗). People still love his poems very much now. He was a 6 poet(诗人), but he was always 7 because the king didn't take his advice and it made his country lose many battles(战役).
At last, he jumped into a 8 and died. It was the 9 day of the fifth lunar(农历)month that year.
The Chinese people will never 10 Qu Yuan. They eat rice dumplings (粽子) and have dragon (龙) boat race in honor of(纪念)him every year.
( )1. A. job B. advice C. idea D. advices
( )2. A. But B And C. Then D. Or
( )3. A. were off B. stayed in the country C. died D.take office ( )4. A. got B. lost C. wanted D.won
( )5. A. good B. hard C. bad D.easy
( ) 6. A. usual B. happy C. talented D.better
( )7. A. exciting B. sad C. healthy D.excited
( )8. A. river B. mountain C. town D.city
( )9. A. eight B. six C. fifth D. fifteenth
( )10. A. forget B. remember C. study D.began
阅读理解
A
Many people sleep late on Sunday mornings, but others don't. However, almost everyone reads the Sunday paper. The Sunday paper is usually very thick. It has many ads and many different parts. The parents in the family like the front page, and the world news page. Many men also read the sports page.
Most men don't read the women's pages, but the mother of the family usually does. The women's pages have the news about parties, food, health and clothes. Most Sunday papers have interesting stories. Children enjoy them. Old people read the death notices. They tell about people who have died during the week.
( ) 1. The parents in the family like the sports page.
( ) 2. The father of the family usually read the women's pages.
( ) 3. Only old women read the death notices.
( ) 4. Almost all readi the Sunday paper.
( ) 5. This passage is about the Sunday paper.
B
For many people the subject of hiccups (嗝) is a joke, but for Harry Mendes, a fifteen-year-old schoolboy from Birmingham, it was something quite different.
His hiccups began one Sunday lunch time and continued day and night for two weeks. After the first week, Harry's parents took him to hospital, but it took another week for the doctors to cure his attack.
Harry, who is now back at school, described what happened to him.
“When I began to hiccup, I drank a glass of water but that didn't do any good. That evening I had hiccups every four seconds. We tried everything to stop them. I held my breath and drank cold drinks. My father even tried to give me a shock but that didn't work either.”
After a week of sleepless nights, he went to hospital. The doctors took an X-ray of his chest but they couldn't find anything wrong.
“They gave me some medicine and my hiccups slowed down, but it was another week before the medicine worked completely and my hiccups stopped.”
Harry was very lucky. The world record holder is the American farmer Charles Osborne, who hiccupped for sixty-eight years. He stopped in 1990 at last, but nobody knows why.
（）1.Harry's hiccups lasted ____.
A. a week
B. fourteen days
C. twenty-eight days
D. one month
（）2.His hiccups started after he ____.
A. drank a glass of water
B. went to hospital
C. ate an Indian meal
D. finished his homework
（）3.His parents decided to take him to hospital when he ____.
A. hiccupped for four seconds
B. held his breath
C. hiccupped at night
D. couldn't stop hiccupping
（）4.His hiccups completely stopped one week after the doctor ____.
A. gave him some medicine
B. took an X-ray of his chest
C.gave him a shock
D. let him drink cold drinks
（）5.What does “shock” in this passage mean？
A.震惊
B. 休克
C. 喷嚏
D. 哈欠
C
Come and see the Indian elephants and the new tigers from America. The bears are waiting to meet you, and the monkeys from China are waiting to throw things at you. The lovely dogs from Australia are waiting to laugh at you, and the giraffes from Zambia are waiting to look down on you.
Tickets
Grown-ups：＄2.00
Children：Over 12 ＄1.00 Under 12 Free
Opening time 9:00 a.m.— 4:00 p.m.
Except Friday 10:00 a.m. — 3 :00 p.m.
Keep the zoo clean！
Do not touch，give food or go near the animals.
（）1.How many kinds of animals are talked about in the passage？
A. Four
B. Five.
C. Six.
D. Seven.
（）2.Now Mr. Smith is in the zoo with his two sons, one aged 14 and the other 10, how much are the tickets together？
A. $4.00
B. $2.00
C. $3.00
D. $1.00
（）3.Which of the following is the visiting time？
A. 8:30 a.m. Monday
B. 9:30 a.m. Friday
C.3:00 p.m. Sunday
D. 5:00 p.m. Tuesday
（）4.From the passage we can guess the animal “giraffe” must be very _______.
A. fat
B. long
C. strong
D. tall
（）5.Which of the following can we do in the zoo？
A. To give some food to the dogs.
B. To touch the monkey on the head.
C. To throw things everywhere.
D. To take a few nice photos.
D
Yang Liwei circled the earth 14 times in 21 hours on October 15 and 16, 2003, landing on the grasslands of Inner Mongolia. Looking a little tired, Yang stepped out of Shenzhou V, smiling and waving at the waiting people. “I feel very good.” Yang said to Premier Wen Jiabao on the phone. Yang sa id to a newspaper, “For our motherland and me, this is a great moment.”
China’s launch of Shenzhou V shows a higher starting point. It has two special systems（系统）to protect the spaceman, but neither Russian rockets（火箭）nor American ones have.
Yang didn’t know that he was chosen as China’s first spaceman until just before the launch. Although Yang was excited at the news, he still slept at 8p.m. as usual and was woken up at 8p.m. the next morning. Before the launch, Yang ate Chinese traditional food-dumplings. We all know that travelers usually eat them before going on a journey for good luck.
A stamp Success of China First Manned Space Flight was issued（发行）on October 16, 2003, making China the third country to send a spaceman into outer space.
( )1. It took Yang Liwei_____ to travel around the earth every circle.
A. 6 hours
B. 90 minutes
C. 2 days
D. 21 hours
( )2. How did Yang Liwei feel after he came back to the earth?
A. Quite tired.
B. A little scared.
C. Tired but excited.
D. A little nervous
( )3. Which of the following statement is right?
A. There is no difference between China’s spaceship and other countries.
B. Yang Liwei knew he would be China’s first spaceman long before.
C. From the news, Yang Liwei was too excited to fall asleep.
D. Yang was proud of the flight.
( )4. What does the underlined word “launch” mean?
A. 发射
B. 出发
C. 制造
D. 设计
( )5. China issued the stamps to _________.
A. leave them in space
B. give them to Yang Liwei as a reward
C. celebrate the success
D. give them to Russian and American spacemen.
E
Experts(专家) say that students usually need eight to ten hours’ sleep at night, but most Chinese students do not get enough sleep. Some Chinese parents are usually glad to see their children studying late. They will think their children work very hard, but not all parents are happy about this. Once a mother told us that every morning her 10-year-old
boy put up one finger (手指) with his eyes still closed, begging(请求) for one more minute to sleep. Like thousands of students “ early birds” in China, he has to get up before six every morning.
A report shows that withou t a good night’s sleep, students seem to be weaker (虚弱) than they should be. Many students have fallen asleep during class at one time or another. Too much homework is not the only reason why students stay up late. Some watch TV or play the computer games late into the night.
Experts have ever said that the students should develop good study habits. So some clever students never study late, they are able to work well in class.
( ) 1. The 10-year-old boy begged for more minute to sleep because__________.
A. he didn’t have enough sleep
B. it wasn’t time for him to get up
C. he didn’t want to go to school
D. he wanted his mother to wake him up
( )2. In this passage we know if students don’t get enough sleep, they may________.
A. become too weak to sleep
B. not work well in class
C. go to bed early
D. be weak in English
( )3. In this passage “early birds” means “persons who ______________”
A. get up early
B. get up late
C. sleep less
D. don’t want to sleep
( )4. “Stay up late” here means “_____________”
A. study late
B. watch TV late
C. not go to bed until late
D. stay outside
( )5. According to the passage, which of the following is right?_________
A. If you want to study better, you must work hard at night.
B. Sleeping less means working hard.
C. Some clever students are able to work well in class because they have good study habits.
D. Students don’t have enough sleep because they have lots of homework to do.
条件状语从句的四种类型解析
条件状语从句的四种类型解析条件状语从句是英语语法中常见的一种从句类型，用于表示一个条件或假设。它可以通过四种不同的方式来表达，在文章中起着重要的作用。本文将对这四种类型进行详细解析。 第一种类型：真实条件状语从句 真实条件状语从句用来表示一个可能发生的条件和其结果。它的结构是“if + 陈述句，陈述句”。该类型的状语从句使用的是一种常见、普遍的条件句结构。 例如： If it rains, we will stay at home.（如果下雨，我们会呆在家里。）If I have time, I will go to the library.（如果我有时间，我会去图书馆。） 这种类型的状语从句所表达的条件通常是可能实现的，所以它与现实情况相符。 第二种类型：虚拟条件状语从句 虚拟条件状语从句用来表示一个假设性的条件和其结果。它的结构是“if + 过去式，would/could/might + 动词原形”。该类型的状语从句常用于表达不太可能实现的条件。 例如：
If I were rich, I would travel around the world.（如果我富有，我会周 游世界。） If he had studied harder, he could have passed the exam.（如果他努力 学习，他本可以通过考试。） 在这种类型的状语从句中，主句通常包含一个虚拟语气的动词，表 示对现实情况的一种想象或假设。 第三种类型：反过来的条件状语从句 反过来的条件状语从句用来表示一个反向的条件和其结果。它的结 构是“had/should + 陈述句，would/could/might + 动词原形”。该类型的 状语从句常用于反向的条件假设。 例如： Had it not been for your help, I would have failed.（如果不是你的帮助，我就会失败。） Should you need any assistance, feel free to contact me.（如果你需要 任何帮助，随时联系我。） 这种类型的状语从句中，常常使用倒装结构，以突出条件的反向性质。 第四种类型：省略if的条件状语从句 省略if的条件状语从句是指省略if的条件部分，直接使用陈述句作 为状语从句。这种结构常用于对某一成立条件的肯定或推测性陈述。
条件状语从句
条件状语从句 一．定义：在复合句中做条件状语的从句称为条件状语从句。 二．引导词：if, unless, so/as long as, on condition that, in case, once等。 三．条件句的分类： 1. 真实条件句：有可能实现的条件。 2. 非真实条件句：条件不可能实现或实现的可能性极小（用虚拟语气）（高中内容）。 常见的都知道if引导的句子，“主将从现”，现在具体归纳一下总体的条件状语从句的用法。 【语法点一】if引导的句式（结果肯定出现） 【语法点二】if引导的句式（结果可能出现） 【语法点三】unless引导的句式 【语法点四】so/as long as引导的句式 ★▲【语法点一】if引导的句式（结果肯定出现） 常见句式：一般现在时+ if + 一般现在时 Eg. If you cool water, it turns into ice. If you don’t give plants water, they die. If you put wood into water, it floats. ★▲【语法点二】if引导的句式（结果可能出现） 常见的句式：一般将来时+ if +一般现在时；即“主将从现”，此时if翻译为“如果” Eg. If it doesn’t rain tomorrow, we will go for a picnic. If you hurry up, you will catch the early bus. ★【拓展一】在if引导的句式里，主句是含有情态动词以及主句是祈使句的情况。 A.祈使句+ if + 一般现在时（主祈从现） Eg. Put up your hand if you have any questions to ask. Please let me know if you meet any difficulty. B.情态动词+ if + 一般现在时（主情从现） Eg. You must go to see a doctor if you have a fever. If the traffic lights turn red, all cars and bus must stop. ★▲【拓展二】祈使句，and/or +句子（一般将来时），可以和if引导的句子相互转换, and 表顺承关系，or表转折，翻译为“否则” Eg. Hurry up, and you will catch the early bus.
条件状语从句
条件状语从句 一、条件状语从句通常由if（如果）, unless（除非），as long as（只要）引 导。 eg：If it rains tomorrow, we won’t go to the park. 如果明天下雨，我们就不去公园了。 Unless weather stops me, I go for a walk every. 我每天都会去散步，除非遇上坏天气。 Our parents will be pleased with our performance as long as we try our best. 只要我们竭尽全力，父母就会满意我们的表现。 Our parents will be pleased with our performance _____ _____ ______ we try our best. 二、if引导的条件状语从句 eg：If you want to go, please let me know. If the green light isn’t on, wait for a minute. (2)“祈使句+ and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。 注意：A. “祈使句+ and + 陈述句”可以转化为if引导的肯定条件状语从句，而且主语是第二人称。 B. “祈使句+ or + 陈述句”可以转化为if引导的否定条件状语从句，而且主语是第二人称。 eg：Study hard and you will pass the exam. =If you study hard, you will pass the exam. Hurry up, or you’ll be late. =If you don’t hurry up, you’ll be late. 考题Work hard，________ you may catch up with your classmates soon. A.or B.but C.and D.yet 用if连接下列句子 1、Go to bed early and you will have a good rest. 2、Hurry up, or you’ll miss the bus.
条件状语从句语法讲解
2) 用法： (1)条件状语从句通常由连词if引导，意为“如果、假如”，主句不能用be going to 表示将来，而应该用shall，will。 If you leave now, you are never going to regret it. (错误) If you leave now, you will never regret it. (正确) (2)if “如果”，引导条件状语从句，主句用一般将来时，从句则用一般现在时，如： If it rains tomorrow, I shan’t climb the hills. 另外，主句是祈使句或含有情态动词，从句也用一般现在时。如： Please call me if he comes next Sunday. Can you call the policeman if you are in the trouble. 注意宾语从句中的if与条件状语从句if的区别。宾语从句中的if“是否”相当于whether，引导宾语从句，时态需根据语境确定。如果主句用一般现在时，从句可以根据具体情况选用时态，如果主句用一般过去时，从句必须用过去式的某种形式。
I don``t know if it will rain tomorrow. 我不知道明天是否会下雨。 Our teacher said there was going to be a football match the next month.我们说下月将有场足球比赛。 （注意）下列从句中的will不是将来时助动词，而是情态动词。翻译为“愿意”。 If you will excuse me,I really must go to bed . 如果你能原谅我的话，我真的要睡觉了。 If you will wait a minute ,I’ll go and tell my mother that you are here . 如果你愿意等一会的话，我去告诉我妈妈你来了。 试比较下列句子： If you see him tomorrow ,give him this book . 如果你明天去看他，给他这本书。 If you will see him tomorrow ,give him this book . 如果你明天愿意去看他，给他这本书。 2）unless引导的条件句，表示强烈的否定。翻译为“除非……”。“非……不可。” I shan’t go unless he asks me . 他不来请我我就不去。 You will fail unless you work harder . 你不努力就会失败的。 Don’t come unless I call you . 我不叫你就别来。 （注意） unless 从句里的谓语只能是肯定式，因为本身unless表示否定。 误 : Unless you do not work ,you will fail . 正：Unless you work hard ,you will fail . 正：If you don’t work hard ,you will fai l .
条件状语从句
If 引导的条件状语从句 If I am happy , I will wink my eyes . ↓↓ 表达条件表示结果 ↓↓ 条件状语从句主句 a.我们把if 引导的分句称为“条件状语从句(adverbial clause of condition)”, 把 逗号“，”后的分句称为主句(main clause) , 把整个句子称为“条件句(conditional sentence)”,我们常用条件句来谈论某个动作发生时可能引起的结果。 b.条件状语从句通常使用一般现在时，这里的一般现在时用来表示将来的含义。 主句部分用于表达条件状语从句中的动作可能引起的结果。主句通常使用一般将来时(will), 简单说就是“主将从现”。 c.主句也可以位于条件状语从句之前。 I will wink my eyes if I am happy . 小结：主句位于条件状语从句前没有逗号； 主句位于条件状语从句后有逗号； d.有时在主句部分我们也可以不使用一般将来时，而是用can之类的情态动词， 但它们所表达的含义依然是将来的。 If you visit People’s square , you can also see some famous buildings . e.主句部分有时还可以使用祈使句，它所表达的含义同样是将来的。 Please wait for me if I’m late tomorrow . ** 条件句表可能，主句多用将来时； 条件句表事实，主句用现在时（情态动词、祈使句）。 如果是非真实的条件 If I were you , I would invite him to the party . If he had huried , he could have caught the train . 表示不可实现的条件或根本不存在的条件，从句多用一般过去时或过去完成时，表示对现在或过去的一种假设。 2. unless = if …… not “如果不” You will miss the train unless you hurry up . = You will miss the train if you don’t hurry up . 3.“祈使句+ and / or / or else”引导的结果状语从句，祈使句在意义上相当于条件状语从句。 Step III Summarize and presentation What will you do if …… Step IV Exercise
条件状语从句
条件状语从句 一、If引导的条件句 1、“if从句(一般现在时)+主句(一般现在时)”的条件句----表达真理或事实(动作必然发生)。 If you heat ice, it turns into water.如果你加热冰,它就会变成水。 If you put suger into water, it disappears.如果你把糖放进水里,它就会溶解。 2、“if从句(一般现在时)+主句(一般将来时)”的条件句----谈论可能发生的的事情。 If it rains tomorrow, we’ll stay at home.如果明天下雨,我们会呆在家里。 If I don’t hear from him, I won’t go. 如果没接到他的通知,我不会去。 *【注】这类条件句主句部分还可以用情态动词,如 I may buy a car if I pass the driving test.如果通过驾驶考试,我可能会买一辆车。 If you go to another country, you must obey the local laws.如果你去另一个国家,就必须遵守当地的法律。 3、有时if引导的条件句可以与“祈使句,and/or…”相互转换, If you don’t hurry up, you will miss the bus. =Hurry up, or you will miss the bus.快点,否则你会错过这趟车。 If you use your head, you’ll find a way. =Use your head, and you will find a way.动动脑子的话,你就会想出办法。 二、unless引导的条件状语从句 unless意为“除非、如果不”,用来引导否定意义的条件句,等于“if…not…” Let's go out for a walk unless you are too tired. = If you are not too tied, let's go out for a walk. 如果你不累，我们出去散步吧。 Unless you brush your teeth every day, you will get a toothache. =You will get a toothache if you don’t brush your teeth every day. 如果不每天刷牙,你就会牙疼。
条件状语从句
条件状语从句 条件状语从句 由连接词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。（注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态，从句要用一般现在时,祈使句或情态动词[主将从现原则]（主将从现，将并非指将来时，还只表示将来含义的），并且，切记紧跟着if的那句话是从句。） 编辑本段条件状语从句的有关知识 条件状语从句（用法） 语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如: 1) If you ask him, he will help you.如果你请他帮忙,他会帮你的。 2) If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。 另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如: If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。 那么,除了if之外,是否还有其他连词也可以引导条件状语从句呢?回答是肯定的,不仅有,还有很多。这些词由于出现的频率较小,且用法较复杂一些,所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。 1、unless conj.除非,若不,除非在……的时候 You will fail to arrive there in time unless you start earlier.如果你不早点动身,你就不能及时赶到那儿。
条件状语从句
在句子中做条件状语的从句称为条件状语从句。可置于句首、句尾，有时还可置于主语和谓语之间。引导条件状语从句的连接词有：if ,unless,as/so long as等 1.if引导的条件状语从句 表示在某种条件下某事很可能发生。 If we pay much attention to the earth, we'll have a better world. 如果我们多关爱地球，就会拥有一个更美好的世界 If it rains tomorrow, what shall we do? 如果明天下雨，我们怎么办？ 注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。 What would happen if there were no water ? 如果没有水会怎样？ 2.unless引导的条件状语从句 unless的意思是如果不，除非。可与if...not互换。 You will fail in English unless you work hard. 你英语考试会不及格的，除非你更加努力。 3.as /so long as引导的条件状语从句 as /so long as意思是―只要‖ So long as you're happy,i will be happy. 只要你高兴，我就高兴。 4.once引导的条件状语从句 once引导的条件状语从句，意为―一旦...，就‖，从句可置于主句前或后 Once you begin,never stop. 一旦开始，就绝不要停止 Maths is easy to learn once you understand the rules. 一旦你理解了规则，数学就不难学了。 提示：在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。 If the weather is bad next week, we'll put off the climbing. 如果下周天气不好，我们将推迟爬山。 Father told me if i worked hard he would buy me a gift. 爸爸告诉我，如果我努力学习，他会给我买一份礼物。 If the weather is bad next week, we'll put off the climbing. I.选择最佳答案. ( ) 1.If it ______ sunny tomorrow, I ____ boating. a. is go b. will be, go c. is, will go d. will be, will go ( ) 2.----what will you do if it ______ tomorrow, ----I’ll stay at home and watch TV. a. rain b. rains c. will rain d. is raining 3 Run fast, or you’ll be late for school. _______ you _______ _______ fast, you’ll be late for school. 4. You can buy the dictionary if you take enough money with you. Take enough money with you, ______ _____ ______ buy the dictionary. 5 If there is no air, none of us can live. None of us can live _______ _________. 6. 如果明天有空，我和你一起参观长城。 _______________________________________________
条件状语从句
条件状语从句 定义 在复合句中，由从句表示的状语叫做状语从句。 用途 它可以用来修饰主语中的动词.形容词.副词等。 分类 根据它表达的意思，状语从句可以分为时间状语从句，地点状语从句，条件状语从句，比较状语从句，目的状语从句，结果状语从句和让步状语从句等。 条件状语从句 由连接词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。（注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态，从句要用一般现在时[主将从现原则]，并且，切记紧跟着if的那句话是从句。） 条件状语从句的有关知识 条件状语从句（用法） 语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如: 1) If you ask him, he will help you.如果你请他帮忙,他会帮你的。 2) If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。 另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如: If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。 那么,除了if之外,是否还有其他连词也可以引导条件状语从句呢?回答是肯定的,不仅有,还有很多。这些词由于出现的频率较小,且用法较复杂一些,所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。 1、unless conj.除非,若不,除非在……的时候
条件状语从句英语语法大全
条件状语从句 由引导词if或unless引导的状语从句叫做条件状语从句。例如： 1.If it doesn’t rain tomorrow, we will go hiking. 如果明天不下雨, 我们就去远足. 2.You will get good grades if you study hard. 如果你努力学习,就会取得好成绩. 3.I will go to the party unless he goes there too. 我不会去参加聚会的, 除非他也去.(如果他不去,我也不去.) 4.You will be late unless you leave immediately. 如果你不马上走,你将会迟到的.(=If you don’t leave immediately, you will be late.) 在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。 注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态，从句要用一般现在时,祈使句或情态动词[主将从现原则]（主将从现，将并非指将来时，还只表示将来含义的，跟着if后的那句话是从句。 条件状语从句类型 语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如： 1）If you ask him, he will help you.如果你请他帮忙，他会帮你的。 2）If you fail in the exam, you will let him down.如果你考试不及格，你会让他失望的 if引导的条件状语从句既可以将从句放前面也可以将从句放后面 （如果天下雨，我们就不玩了）If it rains, we will stop playing.‘ 转为We will stop playing if it rains. 另外，if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设，从句多用一般过去时或过去完成时。如： If I were you,I would invite him to the party.如果我是你，我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车，我会到的早一点儿。 其他连词： 1. on condition(that)...在……条件下，如果on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。 I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相，条件是你答应保密。 2. provided conj.假如，除非，以……为条件provided (that) +从句表示一种假设条件 He won't be against us in the meeting provided that we ask for his advice in advance.如果我们提前征求一下他的意见，他就不会在会上反对我们。
条件状语从句
1.概念定义 由引导词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。 注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态,祈使句或情态动词，从句要用现在时态,[主将从现原则]（主将从现，将并非指将来时，还指表示将来含义的，跟着if后的那句话是从句。） 2.类型 语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如： 1）If you ask him,he will help you. 如果你请他帮忙，他会帮你的。 2）If you fail in the exam,you will let him down. 如果你考试不及格，你会让他失望的 if引导的条件状语从句既可以将从句放前面也可以将从句放后面 （如果天下雨，我们就不玩了）If it rains,we will stop playing.‘ 转为We will stop playing if it rains.
另外，if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设，从句多用一般过去时或过去完成时。如：If I were you,I would invite him to the party.如果我是你，我会邀请他参加聚会。I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车，我会到的早一点儿。 那么，除了if之外，是否还有其他连词也可以引导条件状语从句呢?回答是肯定的，不仅有，还有很多。这些词由于出现的频率较小，且用法较复杂一些，所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。 1、unless conj.除非，若不，除非在……的时候 You will fail to arrive there in time unless you start earlier.如果你不早点动身，你就不能及时赶到那儿。 Unless it rains,the game will be played.除非下雨，比赛将照常进行。 2、on condition(that)...在……条件下，如果on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。 I can tell you the truth on condition that you promise to keep a secret.我可以告 诉你真相，条件是你答应保密。 You can go swimming on condition (that) you don't go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。 3、supposing conj.如果，假如supposing引导的条件从句表示一种假设条件。 Supposing it rains,shall we continue the sports meeting? 倘若下雨，我们的运动会还要继续举行吗? Supposing anything should go wrong,what would you do then? 假如出了什么问题，你准备怎么对付? 4、provided conj.假如，除非，以……为条件provided (that) +从句表示一种假设条件。 He will sign the contract provided we offer more favorable terms.如果我们提出更优惠的条件，他就会在合同上签字。 He won't be against us in the meeting provided that we ask for his advice in advance.如果我们提前征求一下他的意见，他就不会在会上反对我们。 从上述例句可以看出if,unless,on condition (that),supposing,provided等词引导的条件状语从句，主从句条件关系分明，结构清晰。 但有些句子，虽没有含条件关系的连词，却也隐含着条件关系，这些句子常用一些词，如but for,without等引出一个介词结构来表示条件，条件应该是虚拟的，或与事实相反的假设。 如：but for若非，要不是 But for the rain,we should have a pleasant journey. 要不是下雨，我们的旅行肯定会很愉快。
条件状语从句的用法及规则
条件状语从句的用法及规则 一、什么是条件状语从句 条件状语从句是一种由两个句子组成的句子，其中一个句子是主句，另一个句子是从句，主句里提出一种条件，如果这种条件符合真实情况，从句中所描述的结果就会发生，否则不会发生，也称为“如果…就…”句型。 1、真实条件句：表示对真实的事件的假设，如果条件成立，其结果就会出现，如“如果天气好，我们就去野餐。” 1、条件句时态 一般情况下，主句用一般现在时，从句要使用一般将来时，如“如果你有时间，就来帮我吧。” 2、从句动词形式 从句动词通常要使用虚拟语气的动词形式，即should、would、could、might、may 等动词，如“如果你有机会，就去旅游吧。” 3、从句连词 条件状语从句中用if或unless开头，如果表示假设的从句中的时间和条件相反，就用unless开头，如“Unless it rains，we'll go for a picnic.” 4、从句祈使句 条件状语从句中如果情态动词后是祈使句，则祈使句要用虚拟语气，如“If you have time，come and help me.” 5、从句否定句 如果从句为否定句，只有not带有情态动词，其余从句里的动词可以使用基本形式，如“If you do not go there，you will regret it.” 四、总结 条件状语从句是一种由两个句子组成的句子。它描述的是在一定条件成立的情况下会发生的一种结果。其中，主句中用一般现在时，从句中用一般将来时的虚拟语气。一般用if或unless开头，如果从句为否定句，只有not带有情态动词，其余从句里的动词可以使用基本形式。
条件状语从句分类
条件状语从句分类 条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设或实际可能性不大的情况，故采用虚拟语气。 eg： If he doesn't hurry up,he will miss the bus.如果他不快点，他将错过巴士。( 真实) If he is free, he will ask me to tell stories.如果他是空闲的，他会要求我讲故事。（真实） If I were you, I would go at once.如果我是你，我马上就会去。（我不是你。非真实，虚拟语气） If there were no air, people would die.如果没有空气，人就会死亡。（不可能没有空气。非真实，虚拟语气） 用法及动词形式 1、表示与现在事实相反的情况： 从句：主语+过去时 主句：主语+should/would/could/might+do eg： 1.If I were you, I would take an umbrella. 如果我是你，我会带把伞。（事实：我不可能是你） 2.If I knew his telephone number, I would tell you. 如果我知道他的电话号码，我就会告诉你。（事实：不知道） 3.If there were no air or water, there would be no living things on the earth. 如果没有水和空气，地球上就不会有生物。(事实：地球上既有空气也有水) 4.If I had any money with me, I could lend you some. 如果我带钱了，我就会借给你些。（事实：没带钱） 5.If he studied harder, he might pass the exam. 如果他再努力些，就能通过考试了。（事实：没有努力） 6.she looked at me as if I had been a stranger. 她看我的样子好像我是一个陌生人。（事实：我并非陌生人） 2、表示与过去事实相反的情况 从句：主语+had done 主句：主语+should/would/could/might+have done eg：
条件状语从句知识点讲解
条件状语从句知识点讲解-CAL-FENGHAI-(2020YEAR-YICAI)_JINGBIAN
条件状语从句 一、条件状语从句的概念 条件状语从句，即在某种条件下，一件事情可能发生。在英语中由连接词if或 unless等引导的状语从句叫做条件状语从句。条件是指某一件事情实现之后（状语 从句中），一件事情（主句）才能发生，通常译作“假如，只要，如果”等意思。条 件状语从句中，主从句的时态要遵循“主将从现”的原则。即，主句是将来时态时， 从句用一般现在时代替将来时态。 二、条件状语从句的引导词 conj . 如果，假如 If you ask him，he will help you．如果你请他帮忙，他会帮你的。 conj.除非 You will fail to arrive there in time unless you start earlier. 如果你不早点动身,你就不能及时赶到那儿。 三、条件状语从句的结构 构成条件从句主句 例句If he comes,he will take us to the zoo. 四、条件状语从句的时态（主将从现） 在条件状语从句中，句子时态往往遵循“主将从现”的原则，即主句用一般将来 时，从句用一般现在时。 时态If＋一般现在时主语＋shall/will+动词原形 1、条件状语从句的主句是一般将来时，那么从句常常用一般现在时。 When I grow up, I’ll be a nurse and look after patients. 我长大后要当一名护士，照顾病 人。 2、如果主句是祈使句，那么从句通常要用一般现在时。 If you want to have a chat ,call me up. 如果你想聊天，打我电话。 3、如果主句是含有情态动词时，根据需要从句多用一般现在时。 You should be quiet when you are in the reading room. 在阅览室时应保持安静。 四．知识拓展 If条件句的同义句：祈使句，and /or+将来时态的陈述句。
条件状语和让步状语从句
六、条件状语从句 在句中作条件状语的从句称为条件状语从句。条件状语从句可置于句首，也可置于句尾，有时还可置于主语和谓语之间。引导条件状语从句的常用引导词有if，unless，as/so long as，once，in case，on condition that，supposing（that），providing（that），given（that）等。在条件状语从句中，通常用一般现在时表示一般将来时，一般过去时表示过去将来时，现在完成时表示将来完成时。 1、if引导的条件状语从句 if是引导条件状语从句最常用的连词，表示在某种条件下某事很可能发生。 If you heat ice,it will melt.如果你给冰加热，它会融化。 特别提示！：if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设，从句多用一般过去时或过去完成时。条件状语从句分为真实条件状语从句和非真实条件状语从句。 If I were you,I would invite him to the party. 2、unless引导的条件状语从句 unless意为“除非，若不” You will fail to arrive there in time unless you start earlier. 除非你早点动身，否则你就不能及时赶到那儿。 特别提示！：unless的意思相当于if···not···但在虚拟的条件句中，if···not···不可换成unless。 3、on condition that```引导的条件状语从句 on condition that```引导的条件状语从句是主句事件发生的提前条件或唯一条件，意为在···条件下 I can tell you the truth on condition that you promise to keep it a secret. 我可以告诉你真相，条件是你答应保守秘密。 4、supposing/provided/providing/given(that)引导的条件状语从句 supposing/provided/providing（that）可以用作连词，意为“如果”，引导的条件从句表示一种假设条件。 Supposing that it rains,shall we continue the sports meeting? 倘若下雨，我们的运动会还要继续举行吗？ 特别提示！： in case 在英国英语中表示目的，在美国英语中可表示条件，意为“万一，如果” 七、让步状语从句 引导让步状语从句的连词有although, though ,as , even if ,even though, if ,when, while, whether, whether```or```,whether(```)or not,whatever, no matter what/how/why等。 1、though/although的用法 although和though意义一样，都作“虽然，即使”解，都表示让步，一般情况下可互换使用，只是although语气较重，大多置于句首。though/although引导让步状语从句
(完整)条件状语从句
初中英语――条件状语从句 一．if 引导的条件状语从句 引导条件状语从句最常用的连词是if，常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的,主句中某种情况发生的概率也是很高的。如： If you ask him，he will help you．如果你请他帮忙，他会帮你的。 If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。If you have finished the homework，you can go home．如果你作业做完了就可以回家了。另外，if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设。从句多用一般过去时或过去完成时，表示对现在或过去的一种假设.如: If I were you，I would invite him to the party．如果我是你,我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic．要不是交通堵塞，我本会来得早一些。 另外你还要注意if 条件句的时态搭配 1．if从句用一般现在时，主句用一般将来时 If he runs, he’ll get there in time。如果他用跑的,他就会及时赶到那儿。 The cat will scratch you if you pull her tail。如果你拉猫的尾巴,它就会抓你。 2．if从句用一般现在时,主句用may/might/can If the fog gets thicker, the plane may/might be diverted。如果雾在大一些,飞机可能就会改在别的机场降落. If it stops snowing, we can go out。如果雪停了，我们就可以出去。 3．if从句用一般现在时,主句用must/should If you want to lose weight, you must/should eat less bread。如果你想减肥，你必须少吃面包。 4．if从句用一般现在时,主句用一般现在时