高中情态动词大全课件
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must
1.must 表示推测时， 只能用于肯定句。 e.g.这个电脑肯定出了问题。 There must be something wrong with the computer. 你努力学了一整天， 一定累了吧 You have worked hard all day. You must be tired.
对现在或将来情况推测：must +动词原形。
must只能用于肯定。否定和疑问分别用can’t 和can。 e.g. He must tell a lie.
Can he tell a lie ? He can’t tell a lie.
*must-should/ought to –may-might/could+do
可能性依次减弱
(对过去情况推测：must may, might)+完 成时。 e.g. You must have met him before.
must—mBiblioteka Baiduy—might可能性依次减弱
must只能用于肯定句，译成“一定”。否定 和疑问分别用can’t / couldn’t和can / could。
Grammar
modal verbs
can could may might shall should must will would 情态动词 ought to have to dare (daren’t) need (needn’t) used to
表示推测
不表示推测
情态动词有一定的意义，但没有人称和数的 变化，不能独立使用，它和后面的动词构成 谓语．
做相反的事情.
2.must +be doing/do 表示对现在的动作进行 肯定推测 e.g.他现在一定在看小说. He must be reading novels now. 他们买了一辆新车。 他们一定很有钱. They have bought a new car. They must have a lot of money.
只作情态动词的
can/could, may/might, ought to， must 可情态可实义的 need, dare/dared 可情态可助动词的 shall/should, will/would 相当于情态动词的 have to, used to
must , can/could, may/might 的用法
I wonder if you could help me. (请
求)
2. can/could have done 对过去发生行为的可 能性进行推测: 刚才我还看见他了， 所以他不可能出国的。 I saw him just now so he couldn’t have gone abroad. 门是锁着的， 所以她不可能在家。 The door was locked. She couldn’t have been at home.
3.must +have done 表示对过去发生的事情作 出的肯定判断 e.g.他们在玩篮球， 他们一定完成了作业。 They are playing basketball, they must have finished their homework. 路是湿的。昨天晚上一定下雨了。 The road is wet. It must have rained last night.
They may come here tomorrow. 他们可能还在等我们呢。 They may be still waiting for us.
2.might 可用于指过去的行为或者表示可能性 更小。
e.g.他也许在做功课吧。 He might be doing his homework now. 我问他我是否可以离开。
3. can/could have done “本可以，本来可能 已经”用于肯定句中，表示对过去发生的事 情做出的判断. e.g.你本来可以考的更好。 You could have had a better mark.
may/might
1.may/might表示推测时，只能用于陈述句， 表示对现在或将来要发生的动作把握不大。 e.g.她们明天可能会到这里来。
e.g. Could /Can it have happened last night ?
It couldn’t/can’t have happened last night.
can/could
1. can /could 表示推测时，只能用在否定句 或疑问句中。 e.g. It’s so late. Can Tom be reading? Can it be Mr. Green? 这个人不可能是玛丽， 她生病了。 It can’t be Mary. She has fallen ill. 她不可能在说谎。 She couldn’t be telling lies.
在疑问句中 could 比can 更有礼貌，在此 不是can的过去式。 e.g. Can you wait a moment please? Liz, can you do me a favor? Excuse me, could you tell me the way to
the station?
must , can/could, may/might 的用法
注意：must用于肯定句中可表示“偏偏”。 Naturally, after I told her what to do, my daughter must go and do the opposite. 自然地，在我交代女儿做什么之后，她偏偏要
I asked him “May I leave now?” I asked him if I might leave.
3.might/may have done,表示对过去发生的动 作进行可能性推测。 e.g.他可能去医务室了。 He may have gone to the clinic. 他可能已经从报纸上知道这个消息了。 He might have read about the news in the newspaper.
1.must 表示推测时， 只能用于肯定句。 e.g.这个电脑肯定出了问题。 There must be something wrong with the computer. 你努力学了一整天， 一定累了吧 You have worked hard all day. You must be tired.
对现在或将来情况推测：must +动词原形。
must只能用于肯定。否定和疑问分别用can’t 和can。 e.g. He must tell a lie.
Can he tell a lie ? He can’t tell a lie.
*must-should/ought to –may-might/could+do
可能性依次减弱
(对过去情况推测：must may, might)+完 成时。 e.g. You must have met him before.
must—mBiblioteka Baiduy—might可能性依次减弱
must只能用于肯定句，译成“一定”。否定 和疑问分别用can’t / couldn’t和can / could。
Grammar
modal verbs
can could may might shall should must will would 情态动词 ought to have to dare (daren’t) need (needn’t) used to
表示推测
不表示推测
情态动词有一定的意义，但没有人称和数的 变化，不能独立使用，它和后面的动词构成 谓语．
做相反的事情.
2.must +be doing/do 表示对现在的动作进行 肯定推测 e.g.他现在一定在看小说. He must be reading novels now. 他们买了一辆新车。 他们一定很有钱. They have bought a new car. They must have a lot of money.
只作情态动词的
can/could, may/might, ought to， must 可情态可实义的 need, dare/dared 可情态可助动词的 shall/should, will/would 相当于情态动词的 have to, used to
must , can/could, may/might 的用法
I wonder if you could help me. (请
求)
2. can/could have done 对过去发生行为的可 能性进行推测: 刚才我还看见他了， 所以他不可能出国的。 I saw him just now so he couldn’t have gone abroad. 门是锁着的， 所以她不可能在家。 The door was locked. She couldn’t have been at home.
3.must +have done 表示对过去发生的事情作 出的肯定判断 e.g.他们在玩篮球， 他们一定完成了作业。 They are playing basketball, they must have finished their homework. 路是湿的。昨天晚上一定下雨了。 The road is wet. It must have rained last night.
They may come here tomorrow. 他们可能还在等我们呢。 They may be still waiting for us.
2.might 可用于指过去的行为或者表示可能性 更小。
e.g.他也许在做功课吧。 He might be doing his homework now. 我问他我是否可以离开。
3. can/could have done “本可以，本来可能 已经”用于肯定句中，表示对过去发生的事 情做出的判断. e.g.你本来可以考的更好。 You could have had a better mark.
may/might
1.may/might表示推测时，只能用于陈述句， 表示对现在或将来要发生的动作把握不大。 e.g.她们明天可能会到这里来。
e.g. Could /Can it have happened last night ?
It couldn’t/can’t have happened last night.
can/could
1. can /could 表示推测时，只能用在否定句 或疑问句中。 e.g. It’s so late. Can Tom be reading? Can it be Mr. Green? 这个人不可能是玛丽， 她生病了。 It can’t be Mary. She has fallen ill. 她不可能在说谎。 She couldn’t be telling lies.
在疑问句中 could 比can 更有礼貌，在此 不是can的过去式。 e.g. Can you wait a moment please? Liz, can you do me a favor? Excuse me, could you tell me the way to
the station?
must , can/could, may/might 的用法
注意：must用于肯定句中可表示“偏偏”。 Naturally, after I told her what to do, my daughter must go and do the opposite. 自然地，在我交代女儿做什么之后，她偏偏要
I asked him “May I leave now?” I asked him if I might leave.
3.might/may have done,表示对过去发生的动 作进行可能性推测。 e.g.他可能去医务室了。 He may have gone to the clinic. 他可能已经从报纸上知道这个消息了。 He might have read about the news in the newspaper.