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. 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. A. has to be B. will be C. mustn’t be D. could be ③I have lost one of my gloves. I _______ it somewhere.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. 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. 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. 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 4. 对已发生事情的肯定推测常用“must, may, might 等+完成式” ；否定...
