Question

By the time I have eaten my breakfast,it's eight o'clock.请解释一下这一句中by the time的用法。

为什么从句要用现在完成时？
我一般见得都是By the time 过去时，过去完成时。初三的学生。。。。没有见过By the time加现在完成时的，所以不太懂啊。

Answer 1

by the time 有两个意思
1、到...为止，一般要求主句用过去完成时没烂。
He had left by the time we reached home.
当我悔察敬们到家的时候他已经走了。
The movie had begun by the time we got there.
当我们到那儿的时候，电影已经开始了。
2、…当……的时候;
如果只是说过去某个时候的状况，用过去时，而不用完成时。
By the time the war was over , death and suffering were to be seen everywhere.在战争结束的时候，到处可见死亡和饥饿。 这里没有“死碧慎亡和饥饿”已经完成的意思，只是描述当时这个时间点的状况。所以用过去时。
By the time we arrived the meeting was over.
我们到达时，会议已结束了。

Answer 2

By the time 是到什么时候的意思 后接从句是要加完成时态

Answer 3

by the time引导现在完成时的时间状语从句，固定用法啦