高中英语Module6TheTangPoemsSectionⅢGrammar情态动词教学案外研版选修

Module 6 The Tang PoemsSection Ⅲ Grammar 情态动词

语法图解

探究发现

①The topic of the poem can't be travel.

②It must be something more personal.

③It may be friendship.

④It might be the journey through life.

⑤Li Bai must have had a strange life.

⑥He can't have been interested in a normal life.

⑦He may have died when he fell out of a boat.

⑧You should read the poem sometime.

⑨Could you answer a few questions, please?

⑩I told her to stop singing, but she wouldn't listen.

[我的发现]

(1)①～⑦句表示推测，其中⑤～⑦句表示对过去所发生的事情的推测。

(2)⑧句表示说话人的意愿，意为“应该”，⑨句表示请求，⑩句表示意愿。

一、情态动词表推测

(一)情态动词表推测的三种句式

1．在肯定句中一般用must(一定)，may(可能)，might/could(也许，或许)。You have worked hard all day.You must be tired.

你辛苦干了一整天，一定累了。

The thought that she might be ill annoyed him.

想到她或许病了，他就不安。

2．否定句中用can't/couldn't(不可能)，may not/might not(可能不)。

If Tom didn't leave here until five o'clock, he can't be home yet. 如果汤姆五点才离开这儿，他此时一定还未到家。

He said that I might not borrow his car.

他说我可能不用借他的车。

3．疑问句中用can/could(能……？)。

Could he have finished the task?

他可能把任务完成了吗？

Can he be at home now?

他现在能在家吗？

[即时演练1] 用适当的情态动词填空

①He must be ill. He looks so pale.

②He was afraid they might not agree with him, but I am not quite sure.

③It can't/couldn't be the headmaster. He has gone to America.

④Someone is knocking at the door. Who can it be?

⑤It may take a long time to find a solution to the problem.

(二)情态动词表推测的三种时态

1．对将来情况的推测，用“情态动词＋动词原形”。

She must/may/might arrive before 5.

5：00前她一定/可能/也许到。

2．对现在或一般情况的推测，用“情态动词＋be”“情态动词＋be doing”或“情态动词＋动词原形”。

At this moment, our teacher must/may/might/could be correcting our exam papers.

这时，我们老师一定/可能/也许在批改试卷。

Mr. Bush is on time for everything. How can/could he be late for the opening ceremony?

布什先生一向准时，这次开幕式他怎么可能迟到呢？

3．对过去情况的推测，用“情态动词＋have＋过去分词”。

I didn't hear the phone. I must have been asleep.

我刚才没有听到电话，我想必是睡着了。

The door is locked. He can not have been at home.

门锁着，他不可能在家。

(三)情态动词表推测的特殊用法

(1)can除了表示推测，用于疑问句和否定句中外，还可以用于肯定句中，表示“在某段时间内一时的可能性”。

It can be quite windy there, especially in spring.

那里有时容易刮风，特别在春季。

(2)must表示“一定，非得；偏要”，语气强烈。

If you must ask for a leave today, you must give out your reason.

如果今天你非要请假的话，你就得说出理由。

[即时演练2]

(1)单句语法填空

①Listen, he must be_reading (read) English.

②Since nobody gave him any help, he must have_done (do) the research on his own.

③It is important to know about the cultural differences that may cause (cause) problems.

(2)选词填空(must/may/might/can/can't)

①If you must go, at least wait until the storm is over.

②We enjoy good weather in January, but sometimes it can be terribly cold.

③I haven't decided where I'm going for my holiday. I may/might go to France.

④The story he told can't be true, because it is not reasonable.

⑤Can they finish this before the deadline?

二、should, could, would的用法

(一)could的用法

1．表示过去一般的能力(即想做某事就随时可以做某事的能力)。

Could you speak English then?

那时候你会说英语吗？

[名师点津] 若表示过去的特定能力(即在过去特定场合做某事的能力)，则不能用could，而用was (were) able to do sth.或用managed to do sth.或用succeeded in doing sth.等。

The fire was very big but everyone was able to escape from the building.

火势很凶猛，但大家都逃了出来。

2．could表示推测，表示某事有可能发生或可能是事实。在肯定句中没有must那么有把握；在否定句中没有can't那么有把握。

He couldn't be a bad man.

他不大可能是坏人。

He could have gone home.

他可能已回家了。

3．比较委婉客气地提出问题或陈述看法。

Could you drive me to the station?