专题09 情态动词和虚拟语气（知识精讲）-2019届江苏高考英语单项填空讲练测精品系列

情态动词 情态动词本身有词义，但是没有人称和数的变化。情态动词有时态的变化，但是不能独立作谓语。情态动词可以表示：能力、义务、可能性和允许等意义；情态动词还可以用来给人们：提出请求、提出建议、提供帮助以及提出意见等。 一、can/could的用法 1.表示“能力” ①Come here, Mary. If you stand at this angle, you ______ just see the sunset. A. must B. need C. can D. should ②There were so many people in the hall then that I _______ hardly pick out my sister. A. should B. would C. could D. might ③It was so noisy that we _______ hear ourselves speak. A. couldn’t　　 B. shouldn’t　　 C. mustn’t　　 D. needn’t 2.表示“允许” 与may/might意义接近。could可用于现在时，只是语气更加委婉、客气，回答时则一般要用can而不用could。 ①_______ I have a word with you? It won’t take long. A. Can B. Must C. Shall D. Should ②—Could I use your bike, Jack? —Of course, you _______. A. can       B. may       C. could       D. might 3.表示“可能性” ①Although you _______ find bargains in London, it’s not generally a cheap place to shop. A. should　　 B. need　　 C. must　　 D. can ②Their hope was that a new and better country _______ be born. A. may 　　 B. could　　 C. must　　 D. need 4.can never/can’t…too表示“无论怎样……也不过分”，“越……越好” can not but do sth.不得不，只好 can not help but do sth.不得不，禁不住做某事 ①Mike is kind, determined and full of energy. In a word ________, I can’t speak too highly of him. A. won’t B. can’t C. can D. will ②He is such an unselfish man. You cannot help but _______ him. A. respect B. to respect C. neglect D. to neglect ③I _______ the truth of your remarks, although they go against my interests. A. cannot but admit B. cannot but to admit C. cannot but admitting D. cannot help but admitting 5.表示“经过努力后终于能……”用be able to，它比can有更多的时态形式上的变化 —Didn’t they come to the party last week? —Yes. They didn’t want to come with us at first, but then we _______ persuade them. A. would B. could C. were able to D. had to 二、may与might 1.表示允许，意为“可以，许可”，用法基本上同can与could。 ①—May I take this book out of the reading room? —No, you _______. You read it in here. A. mightn’t B. won’t C. needn’t D. mu