高一英语语法 情态动词专题 
情态动词是高考考查的重点语法项目之一，最新一年全国17套高考试题对此都有考查。下面就近几年来高考试题中出现的情态动词的考点进行归纳分析，以便同学们复习掌握。
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. （最新一年安徽卷）
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. （最新一年广东卷）
A. has to be B. will be C. mustn’t be D. could be
③I have lost one of my gloves. I _______ it somewhere.（最新一年北京春季卷）
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. （最新一年湖北卷）
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. （最新一年上海春季卷）
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.（最新一年湖北卷）
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. （最新一年全国卷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？（最新一年上海春季卷）
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”；否定推测常用“can, could, may, might等+完成式”。
①I was on the highway when this car went past followed by a police car. They _______ at least 150 kilometers an hour.（最新一年重庆卷）
A. should have been doing B. must have been doing
C. could have done D. would have done
②He _______ have completed his work; otherwise, he wouldn’t be enjoying himself by seaside. （最新一年北京卷）
A. should B. must C. wouldn’t D. can’t