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I haven‘t bought anything for two months 为什么瞬间动词和for连用 求各种专家

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I haven‘t bought anything for two months 为什么瞬间动词和for连用 求各种专家解答
句子是从英语新目标课本找的,应该是正确的.why
还有现在完成时能和when连用吗
haven‘t bought anything 什么也没买是个【否定状态】,否定状态是可以持续的.
再如：
I won't leave until five o'clock.
都知道 until 短语是表时间段的,这就是leave 必须要用否定式的原因-----同理!
如果疑问词是When ,由于它相当于一个过去时间状语,故不可用现在完成时,要用一般过去时
如：
When did you see him?
再问： 也就是说瞬间动词的否定式构成状态相当于可以延续的 可以这样理解吗
再答： 没错
再问： I'll go with you when I have finished my home work 百度文档找的句子 我还想问问这儿的when和疑问词when有什么区别 这里是完成时
再答： 这不是疑问词， 是从属连词（当。。。。时候）， 引导时间状语从句的。 所以我先特地强调过， 是【疑问词】（什么时候） OK？
I haven‘t bought anything for two months 为什么瞬间动词和for连用 求各种专家 —You haven't bought anything for supper,have you?—___.I did They ____ each other for at least two months A.haven't seen I bought the watch two months ago.U mean that U_it for nearl i ___ any books for three months.a haven't buy b hadn't buy I don't like going away for too long里的go 是瞬间动词,为什么可以和too lon A:I haven't seen you for tow months.( B:I 've been to Dalian I stayed there for two months last year.stay是延续性动词,而且还有for+时 i haven't watched a film for three months同义句 Hello.i haven’t seen you for tow Months 怎么回答 I _____ my sister for a few months.A.haven't seen B.have see "Rumble! Rumble!" Oh, I haven't eaten anything for so long t