BY THE TIME相当WHEN=WHEN吗?LET SB TO DO STH对吗?

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BY THE TIME相当WHEN=WHEN吗?LET SB TO DO STH对吗?

BY THE TIME相当WHEN=WHEN吗?LET SB TO DO STH对吗?
BY THE TIME相当WHEN
=WHEN吗?
LET SB TO DO STH对吗?

BY THE TIME相当WHEN=WHEN吗?LET SB TO DO STH对吗?
by 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

by the time: 到…时候为止;到……时候,到……之前;到…时候;到…时
by the time 后面一般跟完成时
应该是let sb do sth

不对

BY THE TIME相当WHEN 是对的!
LET SB TO DO STH不对
LET SB DO STH let Sb+do原形!

BY THE TIME相当WHEN 是对的!
LET SB TO DO STH不对
LET SB DO STH let Sb+do原形!