第1个回答 2022-07-20
1.肯定推测
能用于肯定推测的情态动词：must, may, might, could
语气强弱程度：must表示“一定”，语气最强；may和might表示“有可能，大概”， 相当于perhaps，其中might语气比may稍弱；could语气最弱，表示“或许”，相当于possibly
1对现在或将来事情的推测，结构为：must/may/might/could+动词原形
例You have worked hard all day. You must be tired. 你辛苦干一整天，一定累了。
Jack knows her. He may/might know her address. 杰克认识她。他可能知道她的地址。
That could be harmful. 那或许是有害的。
考—What are you doing this Saturday?
—I’m not sure, but I ______ go to the Rolling Stones concert.（重庆高考）
A. must
B. would
C. should
D. might
选D。句意：——本周六你打算做什么？——说不准，不过或许我会去滚石乐队演唱会。本题考查情态动词的用法。根据答语中“I’m not sure”可知是对将来不太肯定的推测，故选D项。must表示推测时，语气最强，意为“肯定，一定”；would表过去将来或表意愿；should意为“应该”。
2 对现在正在发生的事情的推测，结构为：must/may/might/could be doing sth.
例The lights in his office are on. He must be working there. 他办公室的灯亮着，他一定在办公室工作呢。
3 对过去事情的推测，结构为：must/may/might/could have+动词原形
例The ground is all wet. It must have rained last night. 地面全湿了。昨天晚上一定是下雨了。
2.否定推测
能用于否定推测的情态动词：can, may, might, could
语气强弱程度：can’t表示“不可能”，语气最强；may not和might not表示“可能不会”，语气较弱；could not 语气最弱，表示“或许不会”
1 对现在或将来事情的推测，结构为：can’t/may not/might not/could not+动词原形
例Your answer can’t be right. 你的答案不可能是对的。
2 对现在正在发生的事情的推测，结构为：can’t/may not/might not/could not be doing sth.
例I saw her go downstairs just now. She can’t be studying in her room. 我刚刚看见她下楼了，所以现在她不可能在房间里学习。
3 对过去事情的推测，结构为：can’t/may not/might not/could not have done sth.
例He has gone abroad. He can’t have attended the meeting last Friday. 他已经出国了，不可能出席上周五的会议。
3.疑问推测
能用于疑问推测的情态动词：can, could
1 对现在或将来事情的推测，结构为：can/could+主语+动词原形
例Can he be an engineer? 他会是一个工程师吗？
2 对现在正在发生的事情的推测，结构为：can/could+主语+be doing sth.
例Can she be watching TV at home? 她会在家里面看电视吗？
3 对过去事情的推测，结构为：can/could+主语+have done
例Can they have won the football games last Sunday? 他们会赢了上周五的足球比赛吗？
情态动词用于推测语气的助记顺口溜：
“肯不肯， 妈妈肯，妹不问”。即：can（谐音“肯”）不用于肯定式； must（谐音“妈”）仅用于肯定句； may/might（谐音“妹”）不用于疑问句，仅用于否定句和肯定句。
EXERCISE
1.You haven’t eaten anything since this morning; you ______ be hungry.
A. can
B. may
C. must
D. could
2.—Hi, Tom. Any idea where Jane is?
—She ______ be in the classroom. I saw her on the playground just now.
A. mustn’t
B. can’t
C. may not
D. might not
3.David ______ Beijing now. He has gone abroad.
A. can’t tour
B. couldn’t tour
C. can’t be touring
D. mustn’t be touring
4.My book has disappeared. Who ______ it?
A. must take
B. could take
C. must have taken
D. could have taken
5.He ______ the test again, because he looks upset.
A. must fail
B. must have failed
C. can’t fail
D. can’t have failed
答案
01-05 CBCDB