高中英语语法-情态动词.doc

高中英语 语法篇 内容：情态动词:复习高考常见的情态动词的情态动词的表示“能力”“许可”an/ could may/might ①表示能力can/could 意思是“能够” ②在肯定句中could只表示过去能做某事，但不一定做到了，而was/were able to….enough can not( never) …too 的 意思。 ①A computer_____ think for itself; it must be told what to do. can’t B. mustn’t C. may not D. might not ②The fire spread through the hotel very quickly but everyone _____get out. A. had to B. would C. could D. was able to ③You can________careful while crossing the street. A. never be B. not too C. ever be too D. never be too 表示许可时用may/might ,can/could 都可以，但在问句中用could…?或might…？ 以使口气委婉客气，其回答要用can或maymustn’t表示禁止，不许可Could I call you by your first name? -Yes, you______ A. will B. could C. may D. might ②Johnny, you_____ play with the knife, you___ hurt yourself. A. won’t/can’t B. mustn’t/may C. shouldn’t/must D. can’t/shouldn’t ③-May I take this book out of the reading room? -No, you . You read it in here. （陕西卷） A. mightn’t B. won’t C. needn’t D. mustn’t 表示推断的may must 都可用在肯定句中ust“一定”，语气最肯定的可能性may well很可能，极有可能，表示猜测。当表示猜测时， Eg. He must be in his office, as he is always busy with his work. Eg. Tom said that the shirt was not his, but could be Henry’s. ①Helen _______ go on the trip with us but she isnt quite sure yet. （安徽卷） A. shall B. must C. may D. can ②Mary is in poor health. She ___（可能）be ill at any time. ③(全国Ⅱ)Liza well not want to go on the trip—she hates traveling. A. will B. can C. must D. may 在否定句中只能用can和maycan’t“不可能may not“可能不” ①Michael______ be a policeman, for he’s much too short. A. needn’t B. can’t C. should D. may （高考英语大纲全国II卷） ②I’m afraid Mr. Harding ____see you now . He’s busy. A. can’t B. mustn’t C. shouldn’t D. needn’t 在疑问句只能用can he be very busy now? ②Where ————（可能）she be now? ③-My English-Chinese dictionary has disappeared . -Who _____have taken it? A. should B must C could D. would need must与have to “需要” 区别： need do sth need doin