by the time 引导时间状语从句, 有些和when相似, 呵呵。 就像你这句:
By the time you come back, the meal will be ready。 典型的主将从现。
1 By the time she got up, her brother had already gone into the bathroom。
前面过去时, 后面过完。
2 By the time he is ten, he has outgrown his older brother。
他十岁的时候就已经长得比他哥哥高了。
(从句用一般现在时, 主句用现在完成时, 说明现象)。
3 By the time we arrived, the meeting was over。 均为过去时态。
4 By the time we arrived, the train was already moving。
前面过去时, 后面过进。
5
By the time you receive this letter, I will have left this city for my hometown。
you receive this letter 是将来的时间点, 后面这句应该用将来完成时。
6 We had found out by that time that he had been a thief for a long time。
前后都是过去完成时态, for a long time 要求用完成时态, 另外主从句时间呼应上也要求。
7 I shall be pushing up daisies by the time the project is finished。
等到这项目完成时,我早已入土了。 从句用现在时, 主句用将来进行时, 站在现在的时间节点看未来。
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