1、Unit7 Topic2 语法法专项课件件(情(情态动词can和和could的用法)的用法)初中英初中英语仁仁爱版七年版七年级下册下册语法透析语法透析考点大观考点大观易错辨析易错辨析通关训练通关训练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。3.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 Japa
2、nese.他会说一点日语。例:Can I help you?要我帮忙吗?例:Where can she go now?她现在可能到哪里去了呢?4.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 EnglishCan he speak English?5.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 y
3、our pen?You could be right,but I dont think you are.6.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?7.易错点1can 和 could的区别8.易错点1can 和 could的区别It cant be true.We
4、could go there this summer.(表推测,can用于否定句)(表推测,不限句式)9.易错点1can 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。10.解析解析【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。11.解析解析【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。12.