2021年高考英語情態動詞語法專題
他不可能在說謊。
he can’t have told lies.
他不可能說過謊話。
could+不定式完成式 指過去沒實現的動作，表“本來可以” it’s too late. you could have told him earlier.你本來能早點告訴他的。
may+不定式進行式
may+不定式完成式 表示“可能，也許”，用于肯定句 he may be doing homework.
他也許在做作業。
he may have missed the train.
他可能錯過了火車。
must+不定式進行式 肯定句表示“一定在干某事”
the light is on. he must be working.
燈亮著，他一定在工作。
must+不定式完成式 用于肯定句，表示“準是干了某事” he is sad. he must have failed the exam.他準是考試不及格。
needn’t+不定式完成式 “本來不必做”，只用于否定句 you needn’t have lent the book to him. he bought it already.
你本來不必把這本書借給她，他已經買了一本。
should/ought to+不定式完成式 肯定句表示“本應該做而實際沒做”；
否定句表示“不應該做而實際卻做了” i should have bought it.
我應該把它買下來的。
you shouldn’t have scolded him.
你不應該這樣粗心大意。
ii、實戰演練
填入情態動詞的恰當形式或根據括號所提供的詞填入情態動詞恰當的結構。
1. i should have been there, but i ____________ find the time.
2. helen _______ go on the trip with us, but she isn’t quite sure yet.
3. tom, you ___________ not leave all your clothes on the floor like this!
4. you can’t imagine that a well behaved gentleman _____________ be so rude to a lady.
5. it has been announced that candidates_____________ remain in their seats until all the papers have been collected.
6. ---lucy doesn’t mind lending you her dictionary.
---she ____________. i’ve already borrowed one.
7. john, look at the time. _______________ you play the piano at such a late hour?
8. ---__________ this book be yours?
---no, it ____________ not be mine. it ___________ be his.
9. as a girl, she ____________ get up at six every day.
10. __________ he to clean the classroom after school?
11. you ____________ be tired after the long trip, aren’t you?
12. ---what’s the name?
---khulaifi. __________ i spell that for you?
13. you _____________________ (see) the film, haven’t you?
14. you _____________________ (talk) on the phone at that time, for i couldn’t get through.
15. they _____________________ (miss) the plane, or perhaps they have been prevented from coming for some reason.
16. ______________ you pass the college entrance examinations!
17. he had known the matter before you told him, so you _____________________ (not tell) it to him.
18. i did not call to make any airline reservation but i ________________.