Question

by the time主句用一般现在时，从句用什么时态 主句用一般过去，从句用什么时态

Answer 1

有关by the time 的时态：
1.后接表示现在的时间，用现在完成时。 如 By the time of this term, we have learned 5000 words.
2.后接表示将来的时间，用一般将来时或将来完成时。 如 By the time 2012, we will learn 5000 words. (一般将来时) 或By the year 2012, we will have learned 5000 words. (将来完成时)
3.后接表示过去的时间，用过去完成时。如 I hadn’t found a job by the time my classmates all found their jobs.

追问

老师说主句用一般现在时，从句用will have done

追答

I am also a teacher of English.
相信我！
“老师说主句用一般现在时，从句用will have done”此话严重错误！

Answer 2

1 By the time she COMES tomorrow,we will have done our work.(将来)
2 By the time she CAME last week, they had done the work.（过去）
3 By this time(=now) ,all the students HAVE gone home (到眼下)
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