情态动词用于肯定猜测
1. must用于肯定句,表示较有把握的推测,意为准是,一定。后面接动词原形,表示对现在的推测。如:
-Ive had no sleep for 48 hours. 我已经48小时没睡觉了。
-You must be very tired. 你一定很累了。
2. should用于肯定句中,语气次之,意为很可能,应该,指按常理推测。如:
They left yesterday. They should be home by now. 他们昨天就离开了,现在该到家了。
3. can用在肯定句中,表示理论上的可能性。如:
Smoking can cause cancer. 吸烟有可能引起癌症。
4. may用在肯定句中,表示对现在把握不大的推测,意为也许,可能。如:
Dont play with the knife. You may cut yourself. 不要玩小刀,你可能会伤了自己。
5. could, might也可表示推测意义,常用在过去时态中;但在某些场合下,为了使语气更缓和、更委婉,常用could, might代替can, may。如:
They saw something in the sky last night. It could/might be a UFO. 昨天晚上他们看见天空中有个东西。它有可能是不明飞行物。
You may/might/could be very tired. 你可能很累吧!
情态动词用于否定猜测
1. 表示否定的推测时,cant/couldnt语气最强,指不可能,带有惊异、怀疑的感情色彩。如:
The story sounds reasonable, but it cant be true. 这个故事听起来合情合理,但不可能是真的。
2. 语气不很肯定时,常用may not或might not表否定推测,意为可能不,也许不。如:
He may not/might not be at home. 他可能不在家。
情态动词用于疑问句表猜测
疑问句中的推测,常用can或could,意为可能。如:
Who can it be? Can it be Jenny? 那会是谁呢?是珍妮吗?
The money has disappeared! Who could have taken it? 钱不见了!会是谁拿去的呢?
Oh, how could you be so stupid? 哦,你怎么会这么愚蠢呢?
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