doesn't,isn't,wasn't,hasn't区别以及用法
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doesn't,isn't,wasn't,hasn't区别以及用法
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.
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
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