《2025年名师帮同步学案九年级英语全一册人教版》

二、语法精讲练一练
情态动词表示推测的用法
1. 情态动词表推测
|用法|情态动词|示例|
|肯定推测|must|语气较强,意为“一定”这本字典一定是海伦的。This dictionary ______ ______ Helen's.|
||may/might/could|语气较弱,意为“可能”明天可能会下雪。It ______ ______ tomorrow.|
|否定推测|can't/couldn't|语气较强,意为“不可能”这不可能是杰克的自行车。他的是红色的。This ______ ______ Jack's bike. His is red.|
||may not/might not|语气较弱,意为“可能不”玛丽今天可能不来上学。她生病了。Mary ______ ______ ______ to school today. She's ill.|
2. 情态动词表推测的句型
|句型|示例|
|“情态动词+动词原形”表示对现在的情况进行推测|你现在一定很饿吧。You ______ ______ ______ ______ now.|
|“情态动词+be+动词-ing”表示对正在发生的事情进行推测|露西不可能在做作业。Lucy ______ ______ ______ her homework.|
|“There+情态动词+be+主语+动词-ing”表示“一定/可能/不可能有……在做……”|一定有人在隔壁房间唱歌。There ______ ______ somebody ______ in the next room.|

答案： 1.must be; may/might/could snow; can't be; may/might not come 2.must be very hungry; can't be doing; must be singing

( ) 1.Ants are pretty small. You might think that they ______ be rather weak. But what you might not know is that ants are actually very strong for their size.

A.need
B.can't
C.must
D.should

答案： C

( ) 2.—Where is Monica? I can't find her anywhere.
—She ______ be in the library. She loves reading books when she is free.

A.must
B.need
C.can't
D.mustn't

答案： A