if引导的条件状语从句总结(精)

if引导的条件状语从句总结(精)

if引导的四种条件状语从句

一、零条件句/绝对真实条件句(Zero Conditional)

零条件句,又叫绝对真实条件句,用于阐述事实。用来

表达在该条件下,结果一定会如此(如规则,客观规律、

真理等)。结构是:If+主语+do/does,主语+do/does。

其从句和主句的谓语动词通常为一般现在时。

二、第一条件句/相对真实条件句(First Conditional)

第一条件句又叫相对真实条件句,谈论将来可能发生的

事情,并考虑这件事情的结果。强调偶然性或一次性的

条件,也可以与绝对真实条件句同义。if从句用一般

现在时或其他现在时,表示将来可能发生的事情(条件);

主句用一般将来时,表示这件事情的结果。结构是:If+

主语+do/does,主语+will do。

三、第二条件句/现在虚拟条件句(Second Conditional)

第二条件句是虚拟条件句的一种,即现在虚拟条件句

(Unreal Present),用来表达在现在或将来时间下不太

可能或不可能发生的条件,这种条件句还可以用来表示

试探性的、委婉的语气(可以理解为不大有自信,所以

不太真实的条件)。结构是:①与将来事实相反的非真

实条件句是If+主语+should do/were to do/did,主语+would/should/could/might do;②与现在事实相反的非真实条件句是If+主语+did,主语+would/should/could/might+do。

四、第三条件句/过去虚拟条件句(Third Conditional) 第三条件句是表示与过去事实相反的虚拟语气,是用来表达如果(If)当时那样发生,另外一方面(当时)结果会如何。通常是指过去的事情,带有一切已经太迟而不能够补救的意思。结构是:If+主语+had done,主语+would/should/could/ might+have done。

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

2.if从句用一般现在时,主句用may/might/canIf the fog gets thicker the plane may/might be diverted.

3.if从句用一般现在时,主句用must/shouldIf you want to lose weight you must/should eat less bread.

4.if从句用一般现在时,主句用一般现在时

5.if从句用现在进行时,主句用一般将来时

6.if从句用现在完成时,主句用一般将来时If you have finished dinner I’ll ask the waiter for the bill.

If引导的条件状语从句

If引导的条件状语从句 一、If引导的条件状语从句的结构 If+主语+谓语+其它,主语+谓语+其它.=主语+谓语+其它+if+主语+谓语+其它. 注:①有if 的是从句,另一个是主句 ② if 从句在前有逗号,if从句在后无逗号 eg.If he runs, he will arrive there in time .=He will arrive there in time if he runs . 如果他跑,她将会准时到达. 二、if条件句主句和从句的时态,if译为如果 1.主句用一般将来时(will+ V-原),if 从句用一般现在时(be用is/am /are , 实义动词用V-原/V-三单), 即主将从现 注:①当主语为I ,you, we, they ,复数名词,以及由and连接的两个并列成分等时,实义动词用V-原 ②当主语为he ,she ,it ,that ,单个人名,单数名词等时,用V-三单) eg .If it is (be) rainy , we will stay(stay) at home . If she studies (study ) hard , she will get (get) good grades . 2.若主句中含有情态动词(can/may/ must/may/might/should )时, 主句为情态动词+ V-原,if从句用一般现在时 eg .We can will go(go) out if it stops (stop ) raining . eg.If you want (want) to get good grades ,you should study (study)hard. 3.若主句为肯定祈使句或否定祈使句时,if从句用一般现在时 注:以V-原开头的句子是肯定祈使句,否定祈使句在V-原前加Don’t eg. Eat (eat) them if you are (be) hungry . eg. Don’t go (not go)to play football if she doesn’t finish (not finish)your homework .拓展:if 还可引导宾语从句,译为“是否” If 引导宾语从句时,时态需根据语境确定,如果主句是一般现在时,从句可以根据具体情况选用时态,如果主句是一般过去时,从句必须跟过去时相关 ( )1.----Mike wants to know if _________ a picnic tomorrow . ----- Yes . But if it _________ , We will visit the museum . A. will you have , will rain B. you will have , will rain C. you will have ,rains D. will you have , rain ( )2.We are not sure if it ____ tomorrow .If it ____ , our sports meeting will be put off . A. will rain , rains B. rains , will rain C. will rain ; will rain ( )3. ---Can you guess if Mike _______ swimming this afternoon ? ---I think he will go with us if he _______ fine . A. will go ,is B. will go ,will be C. goes , is D. goes ,will be 答案解析: 1.迈克想知道是否你们明天将去野营,if译为是否,引导宾语从句,时态根据语境 而定,句末有tomorrow , 所以要用将来时。答句为是的,如果天下雨,我们将去参观博物馆,if译为如果,时态要遵循主将从现,答案选C 2.第一个if 译为是否,引导宾语从句,句末有tomorrow , 所以要用将来时,第二 个if译为如果,时态要遵循主将从现,答案选A 3.第一个if 译为是否,引导宾语从句,句末有this afternoon , 所以要用将来时, 第二个if译为如果,时态要遵循主将从现,答案选A

if引导的条件状语从句总结(精)

if引导的条件状语从句总结(精) if引导的四种条件状语从句 一、零条件句/绝对真实条件句(Zero Conditional) 零条件句,又叫绝对真实条件句,用于阐述事实。用来 表达在该条件下,结果一定会如此(如规则,客观规律、 真理等)。结构是:If+主语+do/does,主语+do/does。 其从句和主句的谓语动词通常为一般现在时。 二、第一条件句/相对真实条件句(First Conditional) 第一条件句又叫相对真实条件句,谈论将来可能发生的 事情,并考虑这件事情的结果。强调偶然性或一次性的 条件,也可以与绝对真实条件句同义。if从句用一般 现在时或其他现在时,表示将来可能发生的事情(条件); 主句用一般将来时,表示这件事情的结果。结构是:If+ 主语+do/does,主语+will do。 三、第二条件句/现在虚拟条件句(Second Conditional) 第二条件句是虚拟条件句的一种,即现在虚拟条件句 (Unreal Present),用来表达在现在或将来时间下不太 可能或不可能发生的条件,这种条件句还可以用来表示 试探性的、委婉的语气(可以理解为不大有自信,所以 不太真实的条件)。结构是:①与将来事实相反的非真

实条件句是If+主语+should do/were to do/did,主语+would/should/could/might do;②与现在事实相反的非真实条件句是If+主语+did,主语+would/should/could/might+do。 四、第三条件句/过去虚拟条件句(Third Conditional) 第三条件句是表示与过去事实相反的虚拟语气,是用来表达如果(If)当时那样发生,另外一方面(当时)结果会如何。通常是指过去的事情,带有一切已经太迟而不能够补救的意思。结构是:If+主语+had done,主语+would/should/could/ might+have done。 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 2.if从句用一般现在时,主句用may/might/canIf the fog gets thicker the plane may/might be diverted. 3.if从句用一般现在时,主句用must/shouldIf you want to lose weight you must/should eat less bread. 4.if从句用一般现在时,主句用一般现在时 5.if从句用现在进行时,主句用一般将来时

if条件状语从句的用法_If引导的条件状语从句

if条件状语从句的用法_If引导的条件状语从句 很多英语学习者都觉得If引导的条件状语从句这个句型很难,学习起来很吃力。下面是小编为你整理的If引导的条件状语从句的相关资料,希望大家喜欢! If引导的条件状语从句用法 1.if引导的条件状语从句可以放在主句之前,也可以放在主句之后,如果放在主句之前,中间要用逗号将主句和从句隔开。 例如: If I am free, I will come to see you.

= I will come to see you if I am free. 如果我有空,我就来看你。 2. 在含if引导的条件状语从句的复合句中,主句用一般将来时,从句通常用一般现在时态表示将来意义,即主将从现原则。 例如: If it snows tomorrow, we will go skiing. 如果明天下雪,我们就去滑雪。 3. 在含if引导的条件状语从句的复合句中,语句的谓语还可含有情态动词can、must、may等,主句也可是祈使句。

例如: If it stops raining, we can go out. 如果雨停了,我们就能出去。 4. 在含if引导的条件状语从句的复合句中,如果主句部分描述的是客观事实或真理,要用一般现在时。 例如: If you heat the ice, it turns into water. 如果你加热冰,它就会变成水。

if引导的非真实条件句 对过去的虚拟 条件从句(if):主语+had done 主句might/would/should/could+have done 对现在的虚拟 if+ 主语+动词过去式(be用were)主句might/would/should/could+do 对将来的虚拟 if+主语+动词过去式(be用were)或主语+should do或主语+were to do 主句might/would/should/could+do

If 引导的条件状语从句

If 引导的条件状语从句 If 引导的条件状语从句遵循主过从过、主将从现的原则。 主将从现(主情从现、主祈从现) If it rains tomorrow,I won’t climb the hills. If it doesn’t rain tomorrow,I will go to the countryside with my friends. If 引导的条件状语从句 If 引导的条件状语从句遵循主过从过、主将从现的原则。 主将从现(主情从现、主祈从现) If you will help me,I'll finish it on time. We may go out if it's fine tomorrow. If you finish your homework,you can watch TV. Please call me if you go shopping next Sunday. If I go there,I'll take her some flowers. We'll stay at home if it rains tomorrow. Please call me if he’s at home. If you work harder,you’ll pass the exam. She will visit her grandpa if she has time tomorrow. We’ll take a taxi to the city if the train doesn’t arrive on time. The teacher will be angry if he is late. If引导的条件状语从句与unless引导的条件状语从句的转换 If+否定形式=unless+肯定形式

if引导的条件状语从句

if引导的条件状语从句 含有if引导的条件状语从句的复合句表示假如有从句动作的发生,就会有主句动作的发生。 ★通常情况下,如果主句用一般将来时,if引导的条件状语从句用一般现在时。如: If he misses the last bus, he'll have to walk home. We'll have a party in the garden if the weather is good. ★如果主句是祈使句或者主句的谓语部分含有情态动词,if引导的条件状语从句也常用一般现在时。如: If anyone calls, tell them I'm very busy. If it rains, you can stay at home and relax. 【链接】 本单元我们还学了连词unless,可意为“除非;如果不”,通常可以和if ... not 互换使用。如: He won't go to sleep unless you tell him a story. =He won't go to sleep if you don't tell him a story. 【运用】 含有if和unless引导的条件状语从句的复合句 Ⅰ. 句型转换 1. You will be in the museum. Don't talk loudly. (用if合并为含有条件状语从句的复合句,且从句在前) ___________________________________________ 2. You will take more exercise next year. You will keep healthy. (用if合并为含有条件状语从句的复合句,且从句在后) ___________________________________________ 3. You will work hard. You won't do well in your exam. (用unless合并为含有条件状语从句的复合句,且从句在前) ___________________________________________ 4. Mary will be busy this afternoon. She will play with us.

If引导的条件状语从句

If引导的条件状语从句 很多英语学习者都觉得If引导的条件状语从句这个句型很难,学习起来很吃力。下面是店铺为你整理的If引导的条件状语从句的相关资料,希望大家喜欢! If引导的条件状语从句用法 1.if引导的条件状语从句可以放在主句之前,也可以放在主句之后,如果放在主句之前,中间要用逗号将主句和从句隔开。 例如: If I am free, I will come to see you. = I will come to see you if I am free. 如果我有空,我就来看你。 2. 在含if引导的条件状语从句的复合句中,主句用一般将来时,从句通常用一般现在时态表示将来意义,即“主将从现”原则。 例如: If it snows tomorrow, we will go skiing. 如果明天下雪,我们就去滑雪。 3. 在含if引导的条件状语从句的复合句中,语句的谓语还可含有情态动词can、must、may等,主句也可是祈使句。 例如: If it stops raining, we can go out. 如果雨停了,我们就能出去。 4. 在含if引导的条件状语从句的复合句中,如果主句部分描述的是客观事实或真理,要用一般现在时。 例如: If you heat the ice, it turns into water. 如果你加热冰,它就会变成水。 if引导的非真实条件句 对过去的虚拟 条件从句(if):主语+had done 主句

might/would/should/could+have done 对现在的虚拟 if+ 主语+动词过去式(be用were)主句might/would/should/could+do 对将来的虚拟 if+主语+动词过去式(be用were)或主语+should do或主语+were to do 主句 might/would/should/could+do e.g. Tom got to the station in time because he started earlier. If Tom had started late, he would have missed the train. Do you think the thief entered through the door? No, if he had, I don't believe, he would have broken the living room window. If the book weren't so expensive, I would buy it. If you didn't live so far away, we would be able to visit you more. What would you do if you lost your passport in a foreign country? Why hasn't he come? If he should not come on time, we would have to put off the trip. 2.注意事项 e.g. If she hadn't work hard at English in the past, she wouldn't work as well as a secretary in a large company now. 混合时间的虚拟语气从句为对过去的虚拟,主句是现在。 Had we not used an out-of-date timetable, we wouldn't have missed the train. if引导从句的倒装从句相当于 if we had not used an out-of-date timetable, 同样,were还有should 在从句中都可以提前,省略if.

If条件状语从句

If条件状语从句 If 条件状语从句 if当“是否”讲时,引导的是宾语从句,当“如果”讲时引导的是条件状语从句。 结构:if从句,+ 主句。或主句+if从句(条件句放在前,逗号要放句中间) 1. 和时间状语从句一样,条件状语从句也要注意时态一致。大多数情况下,主句如果是一般将 来时,从句要用一般现在时来表达。如: He will be a doctor when he finishes studying here.(时状从句) If it doesn’t rain tomorrow, we’ll start.(条状从句) 2. 有时用祈使句或情态动词来代替主句的将来时态。如: If you get the book, let me know.(祈使句) If he feels like seeing the sights of the city, he can take a bus tour.(情态动词) 3. 如果主句中的动词是want, hope等词,则用一般现在时。 What do you want to do if you have much money? 习题:1.I don’t know if it____tomorrow. If it_____, I will stay at home. A.will rain; rains B.rains; will rain C. will rain; will rain 2.We won’t hold a sports meeting. It will rain tomorrow. (用if连接句子). __________________________________.

if引导的条件状语从句

If 引导的条件状语从句遵循主过从过、主将从现的原则。 主将从现(主情从现、主祈从现) If it rains tomorrow,I won’t climb the hills. If it doesn’t rain tomorrow,I will go to the countryside with my friends. If 引导的条件状语从句 If 引导的条件状语从句遵循主过从过、主将从现的原则。 主将从现(主情从现、主祈从现) If you will help me,I'll finish it on time. We may go out if it's fine tomorrow. If you finish your homework,you can watch TV. Please call me if you go shopping next Sunday. If I go there,I'll take her some flowers. We'll stay at home if it rains tomorrow. Please call me if he’s at home. If you work harder,you’ll pass the exam. She will visit her grandpa if she has time tomorrow. We’ll take a taxi to the city if the train doesn’t arrive on time. The teacher will be angry if he is late. If引导的条件状语从句与unless引导的条件状语从句的转换 If+否定形式=unless+肯定形式

if引导的条件状语从句

if引导的条件状语从句 if引导的条件状语从句是中考中常考的知识点,我们一起来学习一下它的具体用法吧! 一、连接词if if是引导条件状语从句的连接词,表示主句中动作发生的条件。还是看看具体例子吧! If you get up early, you will catch the bus. 如果你早起的话,就能赶上那班公共汽车。 You must see the doctor if you are ill. 如果你生病了,就必须去看医生。 二、if引导的条件状语从句的构成 构成方式为:“主句+if引导的条件状语从句”或“if引导的条件状语从句+主句”。在含有条件状语从句的复合句中,如主句在前,从句在后,主从句之间不用标点;如要强调从句的内容,则把从句放在主句的前面,这时主从句之间要用逗号隔开。例如: I will go to his birthday party if he invites me. =If he invites me, I will go to his birthday party. 三、if引导的条件状语从句的时态 在一般情况下,如果主句谓语动词表示将来的意义,从句谓语动词用一般现在时表将来。常见的有以下几种: 1. 主句是一般将来时。例如: You will be late for school if you get up late. 如果你起晚了,上学将会迟到。 If it rains tomorrow, we won't go to the Great Wall.

如果明天下雨,我们就不去长城。 2. 主句的谓语动词是want, hope, wish等词。例如: I hope to visit her if I'm free. 如果我有空,我希望去拜访她。 3. 主句的谓语动词含can, may, must等情态动词。例如: If I finish my homework, I can watch TV. 如果我完成了家庭作业,就可以看电视。 4. 主句是祈使句。例如: Don't forget to lock the door if you are the last one to leave. 如果你最后一个离开,别忘了锁门。 【跟踪训练】 一、用所给动词的适当形式填空。 1. If I run every day, I (be) healthier. 2. If you (not eat)healthily, your body won't be well. 3. If you sleep well, you (feel) better. 4. If you (relax), you'll sleep better. 二、选择填空。 1. We won't wait for you _________ you can't come here on time. A. if B. unless C. when D. until 2. If he _________ harder, he will catch up with us soon. A. study B. studies C. will study D. studied

If_条件状语从句归纳总结

If 条件状语从句归纳总结 一.. if意为“如果”,引导真实条件状语从句,可放在主句后,也可放在主句前,常用逗号隔开。 2. 含if引导的条件状语从句的复合句中,主句有下列情况时,从句用一般现在时 表示将来意义。 ①当主句为一般将来时态时。如:If your daughter comes, I will call you up. ②当主句是祈使句时。如:Please stay at home if it rains tomorrow. ③当主句的谓语含有can, may, must等情态动词时。如: If he goes on smoking, it may be very bad for his health. ④当主句的谓语是hope, wish, want等动词时。如: I want to go there if the rain stops. 练习: 1. If he hard, he will get good grades. A. study B. studies C. will study D. studied 2. I want to know if Mary to the party tomorrow. A. go B. went C. will go D. goes 3. Everyone must dress up. If you , they won’t let you in. A. don’t B. won’t C. can’t D. mus tn’t 4. Mary will go to Sanya if she a five-day trip. A. have B. had C. will have D. has 5. If he comes late, he will miss the train. A. and B. so C. / D. or 适当形式填空: 1. If she ______ ( run) every day , she will be much stronger . 2. If you _____ ( be) late for school , your teacher _____ (be)angry . 3. If Mary ______ (win)the prize , her parents will be proud of her . 4. If Tom _____ ( not do ) it , his brother ______ (do) it . 5. We _____ ( get) into trouble if the workers _______ ( not help ) us . 6. Please _______ ( tell ) me if you _______(go). 7. I _______ ( leave) for Beijing if it ________ ( not snow) this afternoon . 8. If it _______(not rain)tomorrow , _____(let)us go shopping . 9. If I get up late tomorrow , I _______ (be)late for school . 10. Please bring your ID card . If you ______ (not bring) your ID card , you can’t go to the party .

if引导的条件状语从句和宾语从句

If的用法 if的条件从句分为真实条件从句和虚拟条件从句. 真实条件从句:真实条件从句适用于主将从现,是假设有可能发生的. 一.位置 在if引导的条件状语从句中,既可以放在主句之前,也可以放在主句之后.假设if条件句 放句首,从句后面要加逗号,和主句隔开. You will catch the bus if you get up early. = If you get up early, you will catch the bus. 二.时态 1.〔主祈从现〕 主句:一般现在时态〔包含祈使句和含有情态动词can, may, must等的句子〕 从句:一般现在时态 2.〔主将从现〕 主句:一般将来时态 从句:一般现在时态 3.从句:现在进行时,主句:一般将来时 If you are looking for Peter you ' find him upstairs.如果你是在找彼得,上楼就会找到他. 4. if从句用现在完成时,主句用一般将来时 If you have finished dinner I' alsk the waiter for the bill.如果你吃完了,我就叫效劳生来算账 5.if条件句谈论的是重复发生和预示要发生的情景和事件,那么主从句大多用一般现在时态. 如:If bears are in danger ,they attack people. 三.考前须知 1.在if引导的条件状语从句中,当主句是一般将来时态时,不能使用be going to结构, 而要用will. 2.在if引导的条件状语从句中,不能使用some,而要用any. 四.同义句转化 1.借助于祈使句+and/or+简单句转化,and表示顺承,or表示转折. 例如:〔1〕If you work hard,you 'll pass the exam. Work hard, and you 'll pass the exam. (2)If you do n't hurry up, you 'll be late. Hurry up, or you 'll be late. 2.借助于介词with或者without来转换 例如:If you help me, I 'll finish my job soon. With your help , I 'll finish my job soon. if条件句不一般,几个要点记心间条件句,放在前,逗号要放句中间.条件句表可能,主句多用将来时;条件句表事实,主句常用现在时. 虚拟条件从句:虚拟条件从句是假设不太可能发生的. IF的虚拟语气有三种: 内容从句主句 与现在事实相反动词过去式〔be用were〕would/could/should/might+动原 与将来事实相反should/were to+ 动原would/could/should/might+ 动原

if引导的条件状语从句

if引导的条件状语从句 if条件句:条件句用于陈述语气,表示假设的情况可能发生,其中if 是“如果”的意思。 用法例句 ①主句为一般将来时态,if从句用一般现在时态(即主将从现)。We will stay at home if it rains tomorrow.如果明天下雨,我将要呆在家。 ②主句中含有情态动词,if从句用一般现在时态。If you finish your homework, you can go home now. 如果你做完了作业,你现在可以回家了。 ③主句为祈使句,if从句用一般现在时态。Don’t jump into the river if you feel very hot. 如果你感到很热,不要跳入河里。 ④主句为过去将来时,if从句用一般过去时态(如果涉及到be动词,一律都用were)。此时,表达的是和现实相反的推测,用虚拟语气。If I were you, I wouldn’t do it like that.如果我是你,我就不会那么做的。 If you gave me some money, I would be very happy. 如果你给我一些钱,我就会很高兴的。 构成条件从句主句 时态If+一般现在时主语+shall/will+动词原形 例句If he comes, he will take us to the zoo. 1) 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. (3)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,

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if引导的条件状语从句

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。If you fail in the exam,you will let him down. If you have finished the homework,you can go home. 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。 If I were you,I would invite him to the party. I would have arrived much earlier if I had not been caught in the traffic. 1.时态应用 if 条件句不一般,几个要点记心间; 条件句,放在前,逗号要放句中间。 条件句表可能,主句多用将来时; 条件句表事实,主句常用现在时。(前后时态一致原则) 2.总结 在if 引导的条件状语从句中,如果从句谈论的是一个有可能发生的事实及其产生的相关的结果,主句用一般将来时态,从句用一般现在时态。如:We can walk there if we can't find a bus. If it rains tomorrow, we will not go to the zoo. What will you do if you find a panda in danger.

如果if 条件句谈论的是重复发生和预示要发生的情景和事件,则主从句大多用一般现在时态。如: If bears are in danger, they attack people. 3.句式转换 1)运用“祈使句+ and / or + 句子(一般将来时)”进行转换。其中,句意表示顺承时用and,表示转折时用or(否则), If you work hard, you’ll pass the exam easily. = Work hard, and pass the exam easily. = Work hard, or you won’t pass the exam easily. 2) 运用without 或with转换条件状语从句 If there is no water, fish will die. = Fish will die without water. 练习: 用括号内所给词的正确形式填空。 1. What will you buy if you ________(have)a lot of money? 2. If it ________(not snow)tomorrow, we will feel unhappy. 3. You mustn’t go to school if you ________(be)still in bed. 4. If he _______(be)at home at that time, he would know it. 6. Please show me the way if you ________(know)it. 7. You will hurt your teeth if you ________(eat)too much candy. 8. If you gave me a toy car, I _________(be)very happy. 9. I would get the prize if I _________(work)hard.

if引导的条件状语从句

if引导的条件状语从句 一、概念 条件状语从句是表示主句动作发生的前提或条件的从句,即“在......条件下某事才能发生”。通常由连词if引导 二、位置 if引导的条件状语从句可位于主句之前或之后。位于主句之前要用逗号与主句隔开;如果放在主句之后,其前不必用逗号。 三、时态 若主句为一般将来时、祈使,或主句含有can、may、must、 have to等情态动词或短语时,if引导的条件状语从句要用一般现在时。(主将从现) 例句: 1.If it rains tomorrow, I won't go to school. =I won't go to school if it rains tomorrow. 如果明天下雨,我就不去上学。 2.If he watches TV, I will watch TV,too. 如果他看电视,我也会看电视。 3.You can pass the exam if you study hard. 如果你努力学习,你就能通过这次考试。 四、句型相互转换: ①祈使句+and/or+一般将来时的句子 If you are quick, you won 't be late for school. = Be quick, and you won't be late for school. = Be quick, or you will be late for school. ②含有介词with或without的句子 If there is no water, fish can 't live. =Fish can't live without water. 五、if还可引导宾语从句,意为“是否”。 I don't know if he will come back tomorrow. 我不知道他明天是否回来。

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