BY THE TIME相当WHEN
5个回答

y the time "到了...时"

一般和完成时连用

By the time l got to the station,the train had already gone.

(过去完成时)

By the time they get here,we'll have finished the work

(将来完成时)

when 就是"在.时候" 表示某一时间点 用法很灵活

只有let sb do sth