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