doesn't,isn't,wasn't,hasn't区别以及用法

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/07/04 15:15:32

doesn't 用于第三人称,时态是现在时,帮助动词构成否定,后面接实意动词,如read,hit,pick等有具体意义的动词.
isn't也用于第三人称,时态是现在时,但由于is是系动词,就是起联系作用的,比如说He is a student,is表示“是”,如果isn't,表示不是.
wasn't是isn't的过去式,除了只用在过去的时间这点不同于is外,其他一样
hasn't是过去完成时,也用于第三人称,表示到.时还没有（做完）.,如He hasn't finished his home work until 12pm. last night.

doesn't,isn't,wasn't,hasn't区别以及用法英语选择题isn't wasn't doesn't haven't isn't doesn't的用法 isn't aren't don't doesn't的区别! isn't doesn't don't的区别 She’s read the story, _____she?A. hasn’t B. isn’t C. doesn’t Mike,( ) so sure!A、isn't B、doesn't be C、hasn't D、don't be isn't working 和doesn't work的区别是什么 wasn't didn't isn't的用法各举两个例子 don't won't doesn't isn't 这些词的用法,欢迎补充 He's read this book before ,< A hasn't he B doesn't he C isn aren't,isn't,wasn't等等怎么读?