初二英语_情态动词专项练习[情态动词]二．情态动词的用法1. must 的用法(1) 必须与have to 相似--Must I wait for him? / Do I have to wait for him?--Yes, you must / have to.(No, you needn’t / don’t have to / may not.)(2) 必定表猜测，否定式can’t，疑问式canThey must be in the library.They can’t be in the library.Where can they be at this hour? 这个时候他们会在哪儿？2.can 和be able to 的用法比较(1)主语是人或动物时两者都可用来表示“有能力”。A deer can / is able to run very fast.(2)be able to 可以表示“在过去某人能够做某事且做到了”。All the people were able to run out of building from thebig fire.3.may 和 can 的用法比较(1)两者都可表示许可或请求准许。You may / can borrow books and magazines from the schoollibrary.--May / Can I use your bike?-- Yes, you may (can). / No, you mustn’t. / No, you can’t (may not). / No, you had better not.(2)may not 和 cannot / can’t 都可以用来表示“不可以”和“不准”。You may not / can’t enter the meeting room because teachersare having an important meeting.(3) may not 可能不 can’t 不可能They may not have time to visit India. 他们可能没有时间访问印度。They can’t have time to visit India. 他们不可能有时间访问印度。(4) 询问可能性时多用 can，一般不用 mayCan the story be true? 这故事是真的吗？4.兼做情态动词和实意动词的need(1) 在疑问句和否定句中可作情态动词或实意动词Need you do so? / Do you need to do so?You needn’t do so. / You don’t need to do so.(2) 在肯定句中只能作实意动词You need to do so. He needs to do so.(3) need 作情态动词+ 动词原形作实意动词+ to+v. / + n. / + vingThe little girl needs some help.The old lady needs to look after the baby.The old lady needs looking after well. = The old lady needsto be looked after well.情态动词( ) 1. You ____ write the poem down. Our teacher will giveus a...
