doesn't,isn't,wasn't,hasn't区别以及用法
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关键看后面的词 如果是动词 比如read 那就doesn't 例如:he doesn't read
后面是名词 比如Jack 那就isn't 例如:he isn't Jack
如果是昨天干的事 过去了 那就wasn't,
后面是名词 比如Jack 那就isn't 例如:he isn't Jack
如果是昨天干的事 过去了 那就wasn't,
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doesn't,isn't,wasn't,hasn't他们分别是does is was has 的否定形式,要从时态上讲,
doesn't是一般现在时,实意动词否定时所用的 例如: I like Eglish. I don't like English.
而is ,was 原句必须有is, was 时,否定时才能用isn't ,wasn't,例如,He is a teacher. He isn' t a teacher. he was given a book. 否定,He wasn't given a book.
hasn't ,也是原句有has 例如:He has learned english for three years. 否定:He hasn't learned english for three years
doesn't是一般现在时,实意动词否定时所用的 例如: I like Eglish. I don't like English.
而is ,was 原句必须有is, was 时,否定时才能用isn't ,wasn't,例如,He is a teacher. He isn' t a teacher. he was given a book. 否定,He wasn't given a book.
hasn't ,也是原句有has 例如:He has learned english for three years. 否定:He hasn't learned english for three years
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