by the time 用于什么时态

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by the time 用于什么时态
by the time 用于什么时态

by the time 用于什么时态
“by the time +过去时”用于过去完成时.如:
By the time he got up,his parents had gone to work.到他起床时,他的父母已去上班了.

用于完成时

过去完成时

by the time 在... 时候之前
一般用于将来完成时.
The project will have been finished by the end of this month.