一、情态动词表推测
1. 肯定的推测一般用must, should, may(might)或could(不用can),其中,must的语气最强,译为“肯定”、“准是”、“想必是”;should的语气次之,译为“很可能”、“应该”,指按常理推测;may(might),could的语气最弱,译为“也许”、“可能”。
①Helen _______ go on the trip with us but she isn't quite sure yet. (2005年安徽卷)
A. shall B. must C. may D. can
②—I've taken someone else's green sweater by mistake.
—It ___ Harry's. He always wears green. (2005年广东卷)
A. has to be B. will be C. mustn't be D. could be
③I have lost one of my gloves. I _______ it somewhere.(2005年北京春季卷)
A. must drop B. must have dropped
C. must be dropping D. must have been dropped
④If I ____ plan to do anything I wanted to ,I'd like to go to Tibet and travel through as much of it as possible. (2005年湖北卷)
A. would B. could C. had to D. ought to
2. 否定推测分为两种情况:
1)语气不很肯定时,常用may not, might not或could not,译为“可能不”、“也许不”。
You might just as well tell the manufacturer that male customers ______ not like the design of the furniture. (2004年上海春季卷)
A. must B. shall C. may D. need
2)否定语气较强时,则用can't,译为“根本不可能”、“想必不会”,表示惊异、怀疑的感情色彩。
①—Do you know where David is? I couldn't find him anywhere.
—Well. He ______ have gone far——his coat's still here.(2005年湖北卷)
A. shouldn't B. mustn't C. can't D. wouldn't
②— Isn't that Ann's husband over there?
— No, it _______ be him I'm sure he doesn't wear glasses. (2004年全国卷Ⅰ)
A. can't B. must not C. won't D. may not
3. 疑问句中的推测,往往用can或could。
Mr. Bush is on time for everything. How ______ it be that he was late for the opening ceremony?(2001年上海春季卷)
A. can B. should C. may D. must
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