初中英语语法专题辅导第九讲情态动词ppt课件

1. If you are in the UK, you have to drive on the left.
2. The animals we eat have to spend their lives living in tiny spaces.
have to 不得不
11.. I hhaavveetotobbeeatawt worokrkatantinneinoe’colo’clkoecvkeeryvedrayy.day.
2. --- Must I be home before 8 o’clock? --- Yes, you must. --- No, you needn’t / don’t have to.
3. There must be something wrong with my computer.
1)must: 必须；mustn’t: 不准，禁止 2)回答带有must的问句时，否定式常用needn’t 或
1.表推测 2.表请求、允许
wk.baidu.com 1. ------MMaayyI IwwatacthchTVTVaftaefrtesur pspueprp?er?
------YYees,sy,oyuomu amy.ay. ------NNNooo,, ,yYooYuuoummmauysatnnyo’tnt.o/ tca/ nc’at.n/’tY. o/uY’dobue’dttebrenttoetr. not. 2. If yoNuoa,reyonuotmcuarsetfnu’tl,. a car may hit you.
（2010年北京） ------＿＿you turn down your radio, please?
------Yes, I can.
A. May B. Need C. Must D. Can （2009年济南） -----Who’s that girl swimming in the pool? Is it Lucy? -----It ＿＿be Lucy. She is sleeping in her bedroom now. A. may B. can’t C. must D. should
情态动词,顾名思义是用来表达感情和态度的 动词。
表明说话人的立场和口气,以及说话想达到的 目的
常用的情态动词有：
can (could), may (might), must, have to, need,
ought to, shall , should
表能力 表推测 表请求、允许
1. Some of us can use the computer now, but we couldn’t ten years ago.
情态动词
and find out
If you want to cross a street, you must wait for the green light. You mustn’t cross in front of the traffic. If the light is yellow, you should wait. If you are not careful, a car may hit you. If you are in the UK, you have to drive on the left.
2. Can/Could I borrow these books? 3. The story can not be true.
1）能，会：表示能力，相当于be able to (be able to 适用于任何时态)。 2）可以，表示许可，(may较正式，could较婉转） 3）可能，表示否定推测，can’t be 不可能
don’t have to. 3) 一定，表示肯定的猜测。 （否定猜测用can’t）
2013泰安 28.—May I smoke here?
--No, you . This is no-smoking room. A. needn’t B. mustn’t C. couldn’t D. wouldn’t
A. would B. needn’t C. may D. should
（2009年广州） — ＿＿＿ I take some photos in the hall? —No, you＿＿＿ . A. Can; needn't B. Must ; mustn't C. Could; won't D. May; mustn't
（2012年济南） ----- Lisa, _____ you speak French? ----- Yes, but only a little.
A. need B. must C. may D. can
2013济南 ---_____I help you, sir?
---Yes, I want a T-shirt. A Can B Should C Must D Would
have to + 动词原形
1) 可以，表示许可，相当于can. (注意问句中的回答）
2) 可能，或许，表示推测 may be 可能
(2010年福州)
-----Dad, must I do my homework now? -----No, you＿＿＿play games with your friends
for a little while.
三、must的用法
1
必须，应该 You must finish your task before
playing games.
2
3
表示推测，意 为“一定”
He must be at home now.
一般疑问句肯 定回答用must， 否定回答则用
needn’t或者
don’t have to.
1. If you want to cross a street, you must wait for the green light. You mustn’t cross in front of the traffic.