2021 年中考英语-----情态动词专项课件（14张PPT）

情态动词
定义：
情态动词表示说话人对某一动作或状态的态度。
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。
（1） 表示能力，“能、会”。 She can swim.
（2） 表示请求和允许。
　　-----Can I go now?
　　----- Yes, you can. / No, you can’t.
（3）可能性。You can go to Beijing by train.
1. can could
一
2. may might
表达可能，可能性。 Tony may be at home.
表示请求和允许。might比 may语气更委婉.
Might/ May I smoke in this room?
　　
3. must, have to
(1) 表示必须、不得不。 You must come in time.
must是说话人的主观看法， 一般现在时
have to则强调客观需要。 有更多的时态形式。
否定形式：mustn’t:不能，禁止
must 与 have to 的区别
4. ?shall, should
(1) 意为“应该”，可表示劝告、建议、义务、责任等。
We should protect the environment.
(2)?shall 用于第一人称，征求对方的意见。
　　What shall we do this evening?
5. ?need
表示需要。否定形式：needn’t :不需要
You needn’t wait.
6. will, would
　　 1) 表示请求、建议等，would更委婉。
　　 Will / Would you pass me the ball, please?
　　2) 表示意志、愿望和决心。
　　 I will never do that again.
意为“最好”，没有人称的变化，后面接不带to的不定式，
7. had better
否定形式为：had better not
We had better go now.
二
表示推测
肯定推测最强
must
否定推测最强
can’t
-- Excuse me, whose book is this?
-- It ______be John's. It has his name on it.
A. must B. need C. can't
A
--Must we hand in our exercise- -books now?
--No, you needn' t. / No, you don' t have to.
(这种情况下， -般不用mustn' t)
考点
Must 提问的疑问句，否定回答用
No, you need n' t. / No, you don' t have to.
情态动词+动词完成式即“情态动词+ have + done分词”，表示对过去行为或动作进行推测、评论或判断。
情态动词+动词完成式
Since the road is wet, it must have rained last night.
1．____you tell me what’s happening over there ?
A． Could B． May C． Might D． Shall
2．______I have a word with the manager ,sir ?
A． Will B． Would C． May D． Can
3． — Something flying far away must be a hawk ．
— No, it _______ be a hawk ．
A．mustn’t B．mightn’t C . can’t D . might
practice
A
C
C
4. The man ______ be my English teacher.
He has gone to Canada.
A. might B. must C. can't
5. --Have you decided where to go for your summer vacation?
--Not yet. We ____ go to Qingdao . It's a good place for vacation .
A. may B. need C. must
practice
C
A