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you bought a new computer last week,_____ you?

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you bought a new computer last week,_____ you?
讲讲为什么?
填:didn't
反义疑问句
因为主语中you bought a new computer last week,的动词是bought,是实义动词,并且是过去式,变反义疑问句的时候,要用助动词did+not→didn't 来完成
再问: 再举些例吧!比如后面部分应与那些构成?比如didn't是did与not构成?
再答: 反意疑问句的回答:前肯后否,前否后肯,根据事实从后往前翻译。如: (1)They work hard,don’t they?他们努力工作,不是吗? Yes, they do.对,他们工作努力。/No, they don't.不,他们工作不努力 (2)They don’t work hard, do they? 他们不太努力工作,是吗? Yes, they do. 不,他们工作努力。/No, they don't. 是的, 他们工作不努力 如果句子中的实义动词是过去式,就用did来变,和上面一样
再问: 有没有不用do或did的?
再答: 有。 如果动词是be动词,就直接在be动词上变。例如: He is a teacher, isn't he? He isn't a teacher, is he? 过去时态 He was a teacher, wasn't he? He wasn't a teacher ,was he?