情态动词用法专练

课件10张PPT。情态动词表示说话人的情绪，态度的动词情态动词无人称和数的变化，
情态动词后面跟的动词须用原形，
否定式构成是在情态动词后面加 "not"情态动词中的can, could, may, might, must都表推测。

must＞can＞ could＞may＞might情态动词可以表示“推测”“允许”“祝愿”“能力”等1. must的用法
（1）意思是“一定、准是”，语气较肯定，较有把握。（2）must表推测只能用于肯定句。
如表示“一定不、肯定不、不可能”的意思时，
要用can`tYou mustn't play football in the streetmustn't意思为“不许、不准”，表示禁止It can't be Tom, he is at home.2.can / could用法
can / could表示的可能性比must小，
常用于否定句（一定不、肯定不、不可能）
和疑问句（会、可能）It can't be Tom, he is at home.
那一定不是Tom，他在家呢。
Can you help me？
你会帮助我吗？3.may, might用法
常用在肯定句中He may be very busy now.
他现在可能非常忙。maybe是副词，意思是“也许、可能”，作状语，常位于句首。 等于perhaps
Maybe she’ll come this afternoon.
她可能今天下午来。 may be，意思是“也许是、可能是”，may是情态动词，be是动词原形，作谓语。 maybe 和 may be 的区别1. –That man must be Sarah’s husband.--No, he_____ be her husband. She is still single.A. can’t B. mustn’t
C. may not D. might not
2. Peter _____come with us tonight, but he isn’t very sure.A. must B. may C. can D. will○○3. David, you _____play with the bottle,
you_______ break it.A. won’t; can’t B. mustn’t; mayC. shouldn’t; must D. can’t; shouldn’t
4. Sue________ come together with us tonight, but she isn`t very sure yet. A. must B. can
C. may D. will
5.This ___be a woman’s book. It ____be a man’s.
A. can’t ; may B. can’t ; must
C. must not ; can D. can’t ; can
○○○6. John isn’t in the classroom. He ___ play soccer on the playground with Bob.
A. can B. must C. should D. can’t
7.-He___ be in the classroom, I think.
-No, he ___ be in the classroom. I saw him
go home a minute ago.
A.can; may not B. must; may not
C. may; can't D. may; mustn't
8.-Is Lena swimming in the pool?
-No, she ___ swim. She is afraid of water.
A. may not B. must not
C. can't D. needn't○○○9 -What do you think “upset” means?
- I’m not sure. It ___ mean “sad”.
A.may B. must C. can D. should
10.-You must be here at six tomorrow moring?
-Sorry. I ___ be here so early.
A.need B.may C.must D.can't○○表示可能性，出来可以用情态动词还可以用possible，probably，possiblypossible 形容词probably 副词 可能性大
possibly 副词 可能性小It's possible to do sth
It's possible that主语 + will probably/possibly + v. I'll probably/possibly see you tomorrow.