语法专项课件(情态动词can和could的用法).ppt

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 hel

2、p you? 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

3、?,You 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.

4、 We could 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. co