be动词-情态动词及助动词用法

be动词-情态动词及助动词用法
be动词-情态动词及助动词用法

七年级英语双休日作业

班级:姓名:等级

英语句型变化总结练习

1、含有be动词am,is,are构成的句子:

变一般疑问句时把am,is,are提到句子的前面,句尾用问号即可。

变否定句时直接在am,is,are后面加not即可。例如:

肯定句:He is a student. 一般疑问句: a student?

否定句: He a student. 肯定句:We are from China. 一般疑问句: from China?

否定句:We from China 2. 由情态动词can, may, should等构成的句子:

变一般疑问句时把can, may,提到句子的前面,句尾用问号即可.

变否定句时直接在can, may,后面加not即可. 例如:

肯定句: She can swim. 一般疑问句:she swim?

否定句: She swim.

3. 由行为动词构成的句子: 需要加助词do或does.

变一般疑问句时把do/does放在句子前面.

变否定句时在主语后面加don’t / doesn’t , 谓语用动词原形。例如:

肯定句: They play football after school.

一般疑问句: play football after school?

否定句: They football after school.

肯定句:Tom watches TV every day.

一般疑问句: Tom TV every day?

否定句: Tom TV every day.

注意:变否定句时相关词的改变

肯定句变否定句时,除将谓语变为否定式外,句中其他词语也可能随之改变:

如将some改为any,too和also改为either,and改为or等:There are some birds in the tree. 树上有些鸟。

→There aren’t ______ birds in the tree. 树上没有鸟。

He likes the book, too. 他也喜欢这本书。

→He doesn’t like the book, ______. 他也不喜欢这本书。He likes singing and dancing. 他喜欢唱歌和跳舞。

→He doe sn’t like singing ______dancing. 他不喜欢唱歌也

不喜欢跳舞。补充练习:

根据句后括号内的要求,填入句中所缺的词:

1. I know the answer. (一般疑问句)

______ ______ know the answer?

2. We can see some birds. (一般疑问句)

______ ______ see ______ birds?

3. There is a computer in the house. (一般疑问句)

______ ______ a computer in the house?

4. There are some flowers on the teachers’ desk. (一般疑问句)

______ ______ any flowers on the teachers’ desk?

5. There are some apples on the tree. (否定式)

There ______ ______ ______ apples on the tree.

6. I think he is old. (否定句) I ______ think he ______ old.

7. Open the window. (否定句) ______ open the window.

8. We can speak good English. (变否定句)

We ______ ______ speak good English.

9. Thank you for helping me. (同义句)

Thank you for ______ ______ .

10. Whose is this book? (同义句) ______ ______ is this?

11. This is her book. (同义句) This book ______ ______ .

12. Her sweater is red. (对划线部分提问)

______ ______ is her sweater?

13. My pencils are in the pencil-box. (对划线部分提问)

______ ______ your pencils?

14. I get up at six every day. (对划线部分提问)

______ ______ do you get up every day?

15. There are fifty students in my class. (对划线部分提问)

______ ______ students are there in your class?

16. These are cars. (用buses改写成选择疑问句)

Are these cars ______ ______ ?

17. The book is in my schoolbag. (变疑问句)

______ the book in your school-bag?

18. Two boys are in our house. (改为there be句型)

______ ______ two boys in our house.

19. Can you find the key? (作肯定回答) ______ ,I______ .

20. It’s Monday today. (对划线部分提问) ______ ______ is it today ?

英语语法-助动词和情态动词用法及习题

目录 1助动词和情态动词的定义 (2) 2 can,may,must (3) 3 Will you~?和Shall I(we)~? (10) 4 would和should (14) 5 have to (16) 练习题 (17) 答案 (18)

1助动词和情态动词的定义 在英语中,助动词一般没有词义,主要帮助构成谓语,表示时态、语态或构成疑问及否定形式。对于助动词,同学们一般了解即可。 情态动词与助动词不同,它有词义,但它也和助动词一样,不能单独作谓语,它必须和其他动词一起构成谓语,另外重要的一点是情态动词没有人称和数的变化;情态动词后必须跟动词原形。 (×)She cans swim well. (×)She can swims well. (○)She can swim well. (○)She swims well. 即使主语是第三人称单数(例如she)can也不能加“s”。 句子中有情态动词can时,即使主语是第三人称单数,也不能在一般动词(例如swim)上加“s”。 1 助动词的种类 1.be(am,are,is,was,were,been,being) 它与现在分词结合,可以构成进行时态(参见第九章),与过去分词结合可以构成被动语态(参见第十三章)。 I am reading the book.我正在读这本书。 The book was written by me. 这本书是我写的。 2. have(has,had,having) 它与过去分词结合,构成完成时态(参见第十一章)。 I have finished my homework. 我已经写完作业了。 3.shall(should),will(would)

完整word版Be动词助动词练习题

小学英语Be动词、助动词、人称代词主宾格练习 一、选择括号里的词的恰当形式填空。 1、There _________(be)some water in the glass. 2、_______(be)Tom ___________(read) a book now? 3、Please pass_____(we) the ball. 4、When _________ (do) your father usually _________ (go) to work? 5、How old __________ (be)you last year? 6、Which dog ________ (be) yours? /Ten and two ________ (be) twelve. 7、Where ________(be) your friends yesterday? 8、I will give the presents to________(they). 9、Lily is taller than (I)./ Put the desk between (he) and (I). 二、选择填空: 1、My brother ____ a teacher. He ____ his pupils very much. A. is, like B. is, likes C. are, likes D. are, like 2、_____ you go to school by bus? A. Are B. Is C. Do D. Does 3、When _____ your birthday? D. does C. do B. is A. are 4、Which ____ bigger, the sun or the moon? A. are B. is C. be D. / 5、What ______ they _____ on Saturdays?

be动词、助动词、情态动词讲解(基础篇)第一讲

be 动词、助动词、情态动词讲解(基础篇) 1、 用单数,反之用复数。 ◆ 句中含有be动词时: 肯定句:主语+be +其他 否定句:主语+be +not +其他 一般疑问句:Be +主语+其他+? 特殊疑问句:疑问词(what / who / when / where)+be +主语+其 他+? I am a teacher. You are right. She is 16 years old. My father is at home. The students are playing games. My teacher was ill yesterday. There is a picture on the wall. There are two books on the table. ★ be 动词用法歌: 我用am,你用are,is 连接他她它。单数名词用is,复数名词全用are。 变疑问,往前提,句末问号莫丢弃;变否定,更容易,be 后not 莫忘记; 疑问否定任你变,句首大写莫迟疑。 ★ be 动词作谓语,它后面一般跟名词、形容词或介词短语。她个子很高。 她在教室里。她是一个高个子的女孩。 2、助动词的用法。 英语句子按正常语序是“什么人或事物” + “做什么”,即,我们常说的“主语+ 谓语+ 其他” 。 ①主语为I 或复数名词、代词时:肯定句:I / We / They / The students

+动词原形+其他+。 We watch TV every night. 变否定:主语+don't +动词原形+其他+。 We don't watch TV every night. 一般疑问句Do + 主语+ 动词原形+ 其他+ ? Do you watch TV every night? Yes, we do. / No, we don 't. 特殊疑问句:疑问词+ do + 主语+ 动词原形+ 其他+ ? How often do you watch TV? ②主语为单数名词或代词时:肯定句:主语+ 动词第三人称单数形式 + 其他+ 。 He watches TV every night. 否定句:主语+ doesn't+动词原形+其他+。 He doesn't watch TV every night. 一般疑问句:Does + 主语+ 动词原形+ 其他+ ? Does he watch TV every night? Yes, he does. / No, he doesn 't. 特殊疑问句:疑问词+ does + 主语+ 动词原形+ 其他+ ? How often does he watch TV? ★主语为单数或不可数名词,谓语要用单数第三人称,反过来,看见动词用了单数第三人称,可以推知主语是单数或不可数名词。 ( )1. How __ ______ your dad help at home? A. do B. does C. is ( )2. ______ goes bad easily in summer. A. Milk B Apples C. Cakes ③过去时的句式(当句子时态为过去时时,动词用过去式,不受主语单复数的影响) 肯定句:主语+ 过去式+ 其他+ 。 He / We got up early every morning last year. 否定句:主语+ didn't + 动词原形+ 其他+ 。 He / We didn't get up early every morning last year. 一般疑问句:Did + 主语+ 动词原形+ 其他+ ? Did he / you get up early every morning last year? Yes, he

英语助动词和情态动词及练习

英语助动词和情态动词及练习 一、概述 不同的时态(一般式、进形式、完成式、将来式),不同的语态(主动、被动),不同的语气(祈使、陈述、虚拟),不同的结构(肯定、否定、疑问),以及说话者本身的态度或命令、请求、愿望、可能等,所有这些都要借助于助动词和情态动词表达出来。助动词一般没有词意,不能单独作谓语动词,除非省略句中。他们只参加时态、语态、语气或否定、疑问结构。情态动词有词义,可以用来表示说话者的语气和态度。主要的助动词和情态动词如下表: 二、助动词 助动词一般没有词意,不能单独作谓语动词。其作用在于帮助构成各种时态、语态、否定、疑问等。 1、助动词be(am, is, are, was, were, being, been)的用法 (1) be后跟现在分词构成进行时态。 Who is playing the violin?谁在拉小提琴? She was reading a book then.那时她正在读书。 (2)be后跟过去分词构成被动语态。 He was asked to do the work.有人要他干这件工作。 You are invited to attend the meetintg.有人邀请你参加会议。 (3)be 后跟不定式作谓语,有如下几种情况: ①表示计划、安排将要发生的事。 Who are we to meet?我们要见谁呀? I'm to have supper with John this afternoon.今天下午我要与约翰一起吃晚饭。 ②表示指示、命令,否定式表禁止。 You are to see the headmaster today.今天你必须去见校长。 You are not to enter the room without permission.未经允许你不能进入房间。 ③表示义务、责任等,同should。 You are to be back before 5.你得在5点钟以前回来。 What is to be done?该干什么。 ④表示可能性,与情态动词may, can同义。 Such books are to be found in any library.这种书任何图书馆都有。 Not a sound was to be heard.一点声响也没有。 ⑤表示后来发生的事,可以用来表示命运或注定 They say good-bye, little knowing that they were never to meet again.他们告别了,没想到再也不能相见了。 He was to regret the decision.他有一天会后悔做出这一决定的。 ⑥用于习语 Where am I to go? 我该向何处去? What am I to do? 我该怎么办? 2、助动词have(has, had, having)的用法 (1)助动词have可以构成完成时或完成进行时

be动词与助动词的用法

be动词与助动词的用法 1.陈述句:be动词第一人称用am,第二人称用are,第三人称单数用is复数用are. 助动词do一般省略,直接用动词,注意动词时态和人称变化.有时在动词前加do,表示强调,加强语气.如:Do be quiet! 2.疑问句:be动词直接提前,其他部分不变(由陈述句转变).助动词do同样,由省略直接提前放置,后面动词不变,注意do的时态和人称变化. 3.否定句:be动词和助动词do后面加not. be作助动词用的形式如下: ①am, is, are, was, were ②助动词+be:shall be, will be, can be, etc. ③have/has/had + been(完成时) ④am, is, …being(进行时) (1)表达进行时态 句型be + V-ing…(进行时态) 例:What are you reading? (你正在阅读什么?) I am reading a magazine. (我正在阅读杂志。) 例:He will be taking a walk in the park at this time tomorrow morning. (明天早晨此时他将会正在公园散步。) 例:She has been teaching English in our school for years. (她已在我们学校教英语许多年了。) 解说第一例句是表达现在进行时,第二例句是将来进行时,第三例句是现在完成进行时。(2)表达被动语态 句型be +p.p. …(被动语态) 例:English is spoken in both Canada and the United States. (加拿大和美国都讲英语。)

be动词-情态动词及助动词用法

七年级英语双休日作业 班级:姓名:等级 英语句型变化总结练习 1、含有be动词am,is,are构成的句子: 变一般疑问句时把am,is,are提到句子的前面,句尾用问号即可。 变否定句时直接在am,is,are后面加not即可。例如: 肯定句:He is a student. 一般疑问句: a student? 否定句: He a student. 肯定句:We are from China. 一般疑问句: from China? 否定句:We from China 2. 由情态动词can, may, should等构成的句子: 变一般疑问句时把can, may,提到句子的前面,句尾用问号即可. 变否定句时直接在can, may,后面加not即可. 例如: 肯定句: She can swim. 一般疑问句:she swim? 否定句: She swim. 3. 由行为动词构成的句子: 需要加助词do或does. 变一般疑问句时把do/does放在句子前面. 变否定句时在主语后面加don’t / doesn’t , 谓语用动词原形。例如: 肯定句: They play football after school. 一般疑问句: play football after school? 否定句: They football after school. 肯定句:Tom watches TV every day. 一般疑问句: Tom TV every day? 否定句: Tom TV every day.

注意:变否定句时相关词的改变 肯定句变否定句时,除将谓语变为否定式外,句中其他词语也可能随之改变: 如将some改为any,too和also改为either,and改为or等:There are some birds in the tree. 树上有些鸟。 →There aren’t ______ birds in the tree. 树上没有鸟。 He likes the book, too. 他也喜欢这本书。 →He doesn’t like the book, ______. 他也不喜欢这本书。He likes singing and dancing. 他喜欢唱歌和跳舞。 →He doe sn’t like singing ______dancing. 他不喜欢唱歌也 不喜欢跳舞。补充练习: 根据句后括号内的要求,填入句中所缺的词: 1. I know the answer. (一般疑问句) ______ ______ know the answer? 2. We can see some birds. (一般疑问句) ______ ______ see ______ birds? 3. There is a computer in the house. (一般疑问句) ______ ______ a computer in the house? 4. There are some flowers on the teachers’ desk. (一般疑问句) ______ ______ any flowers on the teachers’ desk? 5. There are some apples on the tree. (否定式) There ______ ______ ______ apples on the tree. 6. I think he is old. (否定句) I ______ think he ______ old.

助动词与情态动词-讲解及练习测试题

助动词与情态动词 一、助动词 助动词有be, have, do, will, shall。它们本身没有词义,只和实义动词的一定形式构成复合谓语,用来表示时态和语态,构成否定、疑问及加强语气等。 1、be (am, is, are, were, been) (l)“be + -ing”构成进行时态; (2)“be + 过去分词”构成被动语态; (3)“be + 动词不定式”构成复合谓语: ①表按计划安排要发生的事。The prime minister is to visit Japan next year.总理将于明年访问日本。 ? “do + 动 只有 (1)表示能力,如:He can speak English better than you. (2)在疑问句和否定句中表示“怀疑”、“猜测”或“可能性”,如:Can this green bike be Liu Dong's? (3)表示“许可”时can可以和may换用,如:You can (may) go home now. (4)如果要表示语气婉转,可用could代替can,这时could不再是can的过去式,如:Could you come again tomorrow? (5)can和be able to都可表示能力,两者在意思上没有什么区别。但是can只能有现在式和过去式,而be able to 则有更多的形式,如:He will be able to do the work better. 2、may和might (might为may的过去式)的基本用法 (1)表示允许或征询对方许可,有“可以”之意, 如:You may use my dictionary. 在回答对方说“可以做某事”或“不可以做某事”时,一般多不用may或may not,以避免语气生硬或不容气。而用比较婉转的说法进行回答。如:---- May I use this dictionary? ---- Yes, please. 或---- Certainly. 在请求对方许可时,如果Might I…? 就比用May I…? 语气更婉转些,如:May I have a look at your new

(助动词情态动词)练习

专四语法练习2 助动词、情态动词 1. It’s wonderful that you ___C___ have achieved so much in these years. a. may b. can c. should d. would 2. He ___D___ hardly say anything more, since you know about it. a. don’t need to b. needn’t c. needs d. need 3. You __B____ the look on his face when he won the prize. a. would have seen b. should have seen c. must see d. can be seeing 4. Some people think the stock market will crash, but ___B___. a. I wonder if it happens b. I doubt if it will happen c. I am afraid it wouldn’t happen d. I doubt if it does happen 5. “Whatever has happened to George?” “I don’t know. He _B_____ lost.” a. can have got b. may have got c. might get d. could get 6. He has no idea what the book is about. He ___B___read the book.

be动词,一般动词和助动词

be动词、一般动词和助动词 一、be动词、一般动词的现在式 (1)be动词的现在式—am/are/is a.是(表状态) We are happy.—我们很高兴 b.在(表存在) She is in America.—她在美国 含be动词(am/are/is)的肯定句变成否定句时,在be动词后加not即可。 肯定句:主语+am/are/is… 否定句:主语+am/are/is+not… He is a good baseball player. 他是一个好棒球员 (否定句)He is not a good baseball player. = He’s not a good baseball player. = He isn’t a good baseball player. 含be动词(am/are/is)的肯定句变成疑问句时,将be动词拿到主语前,句尾加?即可。肯定句:主语+am/are/is… 疑问句:Am/Are/Is+主语…? 1.That is his camera. 那是他的相机 (疑问句)Is that his camera?

2.The girl is a junior high school student. 那女孩是初中生 (疑问句)Is the girl a junior high school student? 动词开头的疑问句为一般疑问句,可用yes或no回答,而答句中的主语 (问句)Am/Are/Is+主语…? (答句)Yes,主语+am/are/is No,主语+am/are/is not 1.Is that man your math teacher? Yes, he is./No,he is not. 2.Are you eating your lunch? Yes, I am./No, I’m not. (2)一般动词的现在式 凡是日常生活中具体的动作,如:eat-吃饭,walk-走路及抽象的动作如:like-喜欢,think-思考…皆为一般动词 a.大部分动词加s works/plays b.一般动词词尾为o/s/sh/ch时。加es go-goes/wash-washes/watch-watches c.一般动词词尾为字音+y时,去y加ies cry-cries/study-studies have和has has为have(有,吃)的单数形式 They have a lot of money.

Be动词和助动词用法辨析

Be动词和助动词用法区别其实be动词也是助动词(auxiliary verbs)。 英语动词大致可分为三种:助动词(auxiliary verbs),情态动词(modal verbs),实意动词(full verbs)。 助动词(auxiliary verbs):do,be,have。没有实意,“帮助”别的动词,表示时态,否定和提问。情态动词(modal verbs):can,must,may。也是“帮助”别的动词,但是有自己的实意。实意动词(full verbs):play,run,think。其他有实意的动词。 be动词可用作助动词(auxiliary verbs):1,be+Ving:所有的进行时态,如:2,be+过去分词:被动式。 be动词也可用做实意动词(full verbs):be[bi]v.有;在;是。 你这样想,一个句子里要有动词吧。再看看它们的名字,“be 动词”和“助动词”, 先说“be动词”,(1)这名字里有动词,说明他是动词,句子里有他就不会有别的动词(除非这些动词以别的形式出现,这是后话)了,(2)“am,is,are,was,were”叫be动词,是因为他们是be的不同形式 再说“助动词”,(1)一定要注意“助”,是帮助的意思,说明他不是动词,只是起到了辅助的作用,所以,他们就一定要与动词同时出现。[记住啊,他们离不开动词,但是动词没有他们也是可以的]

(2)did,do,does只是do的不同形式,根据你所需要的时态来选择(1)用于肯定句,否定句和疑问句 am:第一人称单数(即只与I连用),用于现在时(一般现在,现在进行,只要那时态中是现在的就行)eg:①I am a girl.一般现在时②I am eating an apple.现在进行时 ③I am going to do my homework.[be going to表将来,将来中只有这一种] is:第三人称单数,用于现在时(一般现在,现在进行,只要那时态中是现在的就行)(it就不举例了)eg:①She/He is a girl/boy.一般现在时②He/She is eating an apple.现在进行时③He/She is going to do his homework.[be going to表将来,将来中只有这一种] are:第二人称单数,所有人称复数,用于现在时(一般现在,现在进行,只要那时态中是现在的就行)eg:①You are a girl. We/You(你们)/They are girls.一般现在时②You are eating an apple.We/You(你们)/They are eating apples.现在进行时③We/You(你们)/They are going to do our/your/their homework.[be going to表将来,将来中只有这一种] was:第一人称单数,第三人称单数,用于过去时(一般过去,

中考英语情态动词、助动词、系动词专项讲解

中考英语情态动词、助动词、系动词专项讲解 中考英语情态动词、助动词、系动词专项讲解 语法精讲 1.can 和could 2.may 和might 3.need, must和have to 情态动词 4. should和ought to 5. shall, will和would 6. had better 1.can和coul d ① can表示能力,意为“能够,可以”,could用于过去时, 例如He can finish his homework al one. 他可以单独完成作业的。 He couldn’t cook when he was 18 years old. 他18岁时还不会做饭。 ② can表示推测,意为“可能”,在否定句中表示否定的猜测,意为“不可能”,could用于对过去的猜测,can’t be 不可能 例如:He could be cooking at this time yesterday. 他昨天这个时候有可能正在做饭。 He can’t be here be cause he has gone to American.他不可能会在这里,因为他已经去美国了。 ③ can表示请求语气,coul d的语气更委婉, 例如:Can I help you? / Coul d I help you? 有什么我可以为您效吗? 拓展:be abl e to=can也为“能够”,用来表示能力(有人称和时态的变化) 例如:He is able to d eal with this problem. 他能解决这个问题的。 2.may和 might

① may表示请求,might语气更委婉, 例如:May I help you? Might I sit here? ② may表示肯定的推测,语气比can更弱,might对过去的推测 例如:Mary may be doing her homework now. May can be doing her homework now. can表达的推测语气比may更强,更有把握。 3. must和have to ①must表示命令、责任,意为“一定,必须”,must not/ mustn’t表禁止,“一定不要”, 例如:Children must stay away from strangers.孩子一定要远离陌生人。 You mustn’t play fire because it’s dangerous. 千万不要玩火,因为太危险了。 拓展:在表示禁止时,会用“No Doing”来表示,如No Smoking. / No Walking.等。 ② must表示推测,语气比can更强. 例如:Mr. Liu must be on holiday now because he is wearing pants. 刘老师现在肯定在度假因为他正穿着平底裤呢!(上课是要穿正装的) ③ Must作一般疑问句开头提问时:肯定用must回答,否定用needn’t或d on’t have to回答。 例如:Must I finish my homework now? Yes, you must. / No, you ne edn’t. ④ must 和have to 的区别: a) must没有人称、时态的变化,而have to根据人称、时态的变化,有不同的形式。 b) Must表示主观上必须做,而have to 表示客观需要。

be动词和助动词句式

1.be动词(am/is/are) 主语be动词(原形)be动词(过去式) I am was He/she/it is was We/you/they are were 口诀:我用am, 你用are,is用在他她它,所有复数全用are ①肯定和否定句 I am (not) from London. He is(not) a teacher. She is(not) in the dining room. My hair is(not) long. Her eyes are(not) small. ②一般疑问句 Am I a Chinese?——Yes, you are. /No, you aren’t. Is the cat fat? ——Yes, it is. /No, it isn’t. Are they American?——Yes, they are. /No, they aren’t. 表示疑问,一般回答只有两种可能Yes或No,句中没有疑问词。 如何将一个肯定的陈述句改为否定句: 1、看句中有无be动词,如有,把be动词提到句首即可。 2、看句中有无情态动词,如有,把情态动词提到句首即可。 3、如上述二者都没有,就应把助动提到句首。分四个步骤: (1)肯定陈述句中本来是没有助动词的,要加上去,位置在主语(某人/某物)后,动词前。 (2)确定助动词用do、does还是did,根据句中动词,动词是原形的助动词就用do,动词是第三人称单数的助动词就用does,动词用过去式的助动词就有did。

(3)把助动词后提到句首。 (4)原句中动词假如发生变化就要恢复成原形。 有some的要考虑是否要用any 2.助动词(do/does/did) 主语助动词(原形)助动词(过去式)否定形式I/We/you/they do did don’t/didn’t He/she/it does did doesn’t/didn’t ①.Do+非第三人称单数+动词原形…? do/don't you/they have...?—Yes, I do/No, I don’t. ②.Does+第三人称单数+动词原形…? does/doesn't he/she have...?—Yes, he does./No, he doesn’t. ③Did+所有主格+动词原形…? did/didn't you/he/she/they go to school?—Yes, i did./No, I didn’t. 3.特殊疑问句 表示疑问,有疑问词开头,回答有很多种可能。常用疑问词:What、Who、When、Which、Why、Whose、How ※What do you/they/we…+动词原形?I/They/We+动词原形… What does he/she/it…He/She/It +(动词+S)…. What did you/they/we/ he/she/it…I/They/We/ He/She/It +动词过去式Eg:What did you do last weekend? I cleaned my room. Who cleaned my room? Your mother cleaned your room. When do you go to school? I go to school at 7 o’clock. Which one is your book? The red one is my book. Why do you like this book? Because it is funny.

中考考点情态动词和助动词

Period Ten 情态动词和助动词 重点掌握情态动词can, may, must, need等词在语境中的运用,情态动词在句子中常用来表示“能力,允许,禁止,意愿,可能”等情感或态度。掌握助动词do, will, shall, have, be在句中的作用。 一、情态动词 1. 情态动词的定义 情态动词表示说话人对所述动作或状态的态度或看法。情态动词本身有词义,但不能独立作谓语,必须和动词一起构成谓语,在各种人称后都用同样的形式。 2. 情态动词的用法 (1)can的用法 ①表示人或物本身所具有的能力,意为“能,能够,会”。eg: Can you skate? 你会滑冰吗? She can speak a little Chinese. 她能讲一点儿汉语。 ②表示可能性,意为“可能会”,常用于否定句或疑问句。eg: Can it be true? 那会是真的吗? That can’t be Mary; she’s in hospital. 那不可能是玛丽;她住院了。 (2) could的用法 ①could可以表示过去的能力,若表示现在的能力时,语气比can委婉。eg: She couldn’t swim half a year ago. 她半年前不会游泳。 What a good idea! Maybe I could talk about English names. 你的想法太好!也许我能谈谈英国人的名字问题。 ②表示礼貌,常用在疑问句中,意为“能,可以”,答语一般用can。 —Could I borrow your bicycle? 我可以借一下你的自行车吗? —Yes, you can./ No, you can’t. 是的,可以。/不,不行。 ③表示猜测、怀疑等态度,一般用于否定句、疑问句或感叹句中。对现在情况表示猜测时,could 比can更 不确定,其结构为“can/could+动词原形”;对过去表示猜测时,结构为“can/could+ have+过去分词”。eg: You could be right, I suppose.我想可能是你对。 Don’t worry. They could have just forgotten to phone. 别担心。他们很可能只是忘了打电话。 (3) may和might的用法 ①表示允许,用于肯定句。eg: You may come if you wish. 你要来就来吧。 Passenges may cross by the footbridge. 乘客可使用步行桥。 ②表示许可,用于疑问句。might是may 的过去式,比may语气委婉。eg: May I come in? 我可以进来吗? Might I make a suggestion ? 我可以提个建议吗? ③表示客观不可能性。eg: Take an umbrella with you. It may rain. 带上雨伞,可能会下雨。 (4) must的用法 ①must表示“必须”时多用于肯定句或疑问句,其否定回答用needn’t;,用于否定句时,表示“不应该,不 许可,不准,禁止”。eg: I must go to the bank to get some money. 我得到银行去取些钱。 Cars mustn’t park in front of the entrance. 入口处不得停放汽车。 ②它在肯定句中,还可表示“推测”,意为“一定”。“must be”表示对现在某事的推测;“must have done” 表示对过去的推测;反意疑问时,要根据must后的be或have来做。eg:

情态动词的用法完整详细

情态动词 定义: 情态动词是一种本身有一定的词义,但要与动词原形一起使用,给谓语动词增添情态色彩,表示说话人对有关行为或事物的态度和看法,认为其可能、应该或必要等。 情态动词后面加动词原形。 分类: 情态动词有四类: ①只做情态动词:must,can(could),may(might),ought to ②可做情态动词又可做实义动词:need,dare ③可做情态动词又可做助动词:shall(should),will(would) ④具有情态动词特征:have(had) to,used to 位置: 情态动词在句中放在谓语动词之前, 谓语动词前若有助动词,则在助动词之前,疑问句中, 情态动词 则在主语之前。 I can see you. Come here. 我能看见你,过来吧。 He must have been away. 他一定走了。 What can I do for you? 我能帮你吗? How dare you treat us like that! 你怎能那样对待我们! 特点: 情态动词无人称和数的变化, 情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加"not"。个别情态动词有现在式和过去式两种形式, 过去式用来表达更加客气, 委婉的语气, 时态性不强, 可用于过去,现在或将来。情态动词属非及物动词,故没有被动语态。情态动词没有非谓语形式,即没有不定式,分词,等形式。 He could be here soon. 他很快就来。 We can't carry the heavy box. 我们搬不动那箱子。 I'm sorry I can't help you. 对不起,我帮不上你。 基本助动词与情态助动词最主要的区别之一是,基本助动词本身没有词义,而情态助动词则有自己的词义,能表示说话人对有关动作或状态的看法,或表示主观设想: What have you been doing since? (构成完成进行体,本身无词义) I am afraid I must be going. (一定要) You may have read some account of the matter. (或许已经) 除此之外,情态助动词还有如下词法和句法特征:

小学be动词的用法及助动词_do

苏打水1. 由连系am,is,are构成的句子:变一般疑问句时把am,is,are提到句子的前面,句尾用问号即可。变否定句时直接在am,is,are后面加not即可。例如: 肯定句:He is a student. 一般疑问句: Is he a student? 否定句: He is not a student. 反问句: He is a student, isn't he? He isn't a student, is he? 画线提问: 对he提问: Who is a student? 对a student 提问: What is he? or What does he do? 2. 由情态动词can, may, should等构成的句子: 变一般疑问句时把can,may,提到句子的前面,句尾用问号即可.变否定句时直接在can,may,后面加not即可. 例如: 肯定句: She can swim. 一般疑问句: Can she swim? 否定句: She can not swim. 反问句: She can swim, can't she? She can not swim, can she? 画线提问: 对she提问: Who can swim? 对swim提问: What can she do? 3. 由行为动词构成的句子: 需要加助词do或does. 变一般疑问句时把do/does放在句子前面. 例如: 肯定句: They play football after school. 一般疑问句: Do they play football after school? 否定句: They don't (do not) play football after school. 反问句: They play football after school, don't they? They don't play football after school, do they? 画线提问: 对they提问: Who play football after school?

系动词助动词情态动词

系动词助动词情态动词内部编号:(YUUT-TBBY-MMUT-URRUY-UOOY-DBUYI-0128)

系动词、助动词、情态动词 一、情态动词 1.can(could):能够、可能、可以;may(might):可以、可能;must:必须; shall:将会;should:应该;will:将会,愿意;would:将会 2.半情态动词(后接动原,但否定和疑问句要借助do):have to不得不,had better最好,used to过去常常 3.情态动词无三单(have to除外);不能单独使用,后接动词原形共同构成谓语 4. need既可做实义动词又可做情态动词(作实义动词,后接to do/doing,否定don’t need to do do/doing;作情态动词,后接动词原形,否定needn’t do) 5.表推测:must be一定是(语气最肯定),can be可能是,may be也许是(语 气最不肯定);can’t be一定不是(语气最肯定,must be的否定形式) 6.maybe也许(副词,常用在句首);may be也许是(谓语动词,用在句中) 7.must与need开头的一般疑问句,肯定回答用must,否定回答用 needn’t/don’t have to(不必). 8.may开头的一般疑问句,肯定回答用may/can,否定回答用can’t/mustn’t. 二、系动词 1.系动词后可接形容词。 2.表示状态的系动词be(am, is, are, was, were,been),keep ,stay,表示感觉的 半系动词feel (摸起来,感觉), look (看起来), smell (闻起来), sound (听起来),taste(尝起来); 三、助动词 1.助动词本身无词义或意义不完整,必须和实义动词共同构成谓语。 2.常用的助动词:be(am, is, are, was, were,been,being)用于进行时态或被动 语态;do(does,did)用于一般现在时或一般过去时的否定句和疑问句; have(has,had)用于完成时态;will,shall,would,should用于将来时态, shall/should只能用于第一人称。 情态动词与系动词练习题 一、基础题 1.-Where's Mr Lee I have something unusual to tell him. -You________ find him. He________ Japan. A. may not; has gone to B. may not; has been to C. can't; has gone to D. can't; has been to 2.-Finish drawing a horse in ten minutes. OK-Sorry. It________ in such a short time. A. may do B. can't be done C. must do D. needn't be done 3.I have my own room in my house, so I________do what I want in it. A. must B. have to C. need to D. can 4.________you mend my car I______not start it. A. Would; would B. Must; must C. Can; can D. May; may 5.________she ride when she was three years old A. Can B. Could C. Need D. May 6. The boy________answer this kind of hard questions one year ago. A. can B. may C. could 7.Who is the man over there Is it Mr Li-No, it________be him. Mr Li is much taller.

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