How do you study for a test?为什么会有一个a呢?还有完成时不能接具体时间的具体时间是指什么?

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How do you study for a test?
为什么会有一个a呢?
还有完成时不能接具体时间的具体时间是指什么?

1.a是因为test是可数名词,不可以单独出现在句子当中.a 还表示泛指,不特指哪一次考试.
2.现在完成时态不能跟明确的过去时间,比如yesterday,last night,in 1988,
5 days ago,等等.
可以跟模糊的过去时间,比如：already,yet,ever,just,recently,lately,before,today,this morning,等等

a test 泛指“测验”
具体时间指具体的表示过去的时间，比如in 1998，last Sunday等

test是可数名词。某次测试a test
现在完成时态不能跟明确的过去时间，比如yesterday,last night,in 1988,
5 days ago,等等。
可以跟模糊的过去时间，比如：already,yet,ever,just,recently,lately,before,today,this morning,等等

a test泛指某个考试 完成时不能接具体时间的具体时间就是 比如
2 o'clock
when i coming这样的时间状语

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