Question

by the time都有什么意思、用什么时态？

Answer 1

举例说明 可用于过去完成时和将来完成时
1.I had finished the work by the time he came back
2.We will have finished the work by the time he comes back
正如上面所举的所举的 是要用完成时 但需注意 句子前后时态应保持一致

Answer 2

举例说明 可用于过去完成时和将来完成时
1.I had finished the work by the time he came back
2.We will have finished the work by the time he comes back

追问

为什么不能用现在完成时 by the time 不就是 到现在为止的意思吗

Answer 3

截止那时 一般用完成时