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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