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1、Unit7 Topic2 语法专项课件(情态动词can和could的用法),初中英语仁爱版七年级下册,情态动词用法大观,情态动词三注意:情态动词表示说话人的语气或情绪情态动词无人称和数的变化情态动词后跟动词原形常见的情态动词:must, can, may, shall, could, might, should, will, would, need等。,can的用法,1. 表示能力时,意为“能、会”。,2. 表示请求或许可时,意为“可以”。,3. 表示猜测时,意为“可能”。,例:He can speak a little Japanese. 他会说一点日语。,例:Can I help you?
2、 要我帮忙吗?,例:Where can she go now? 她现在可能到哪里去了呢?,can的句式结构,肯定句:can + 动词原形,否定句:can后加not(缩写为cant),一般疑问句:can提前,He can speak English.,He can not (cant) speak English,Can he speak English?,could的用法,2.表示过去一般的能力,意为“能、会”。,1. 表示委婉请求,意为“可以”。,3. 表示猜测时,意为“可能”。,Could you speak English then?,Could I use your pen?,You
3、could be right, but I dont think you are.,could的句式结构,肯定句:could + 动词原形,否定句:could后加not(缩写为couldnt),一般疑问句:could提前,I could speak English when I was three.,I couldnt speak English when I was three.,Could you speak English when you were three?,易错点1,can 和 could的区别,易错点1,can 和 could的区别,It cant be true.We cou
4、ld go there this summer.,(表推测,can用于否定句),(表推测,不限句式),易错点1,can 和 could的区别,Can I use your pen? Could I use your pen?,(can表请求),(could表更委婉请求),Yes, of course you can.,注意:对请求、允许相关问句的回答,只能用can。,【典例1】_ I borrow your dictionary? Yes, of course you _. A. Can; could B. Could; can C. Can; can D. Could; could,考查情态动词。句意:我可以借用一下你的字典吗?当然可以。表示“委婉请求”选用could,需要用can来回答。故答案选B。,【典例2】That man must be Sarahs husband. No, he _be her husband. She is still single. A. cant B. mustnt C. may not D. couldnt,考查情态动词。句意:那个人一定是萨拉的丈夫。不,那不可能是她丈夫。她是单身。根据句意,表示确切的否定的推测选用cant,答案选A。,