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
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