正在下载：2020学年九年级英语单元知识点 Unit12 Life is full of the unexpected

1.by the time 到……时为止，在……以前 引导时间状语从句 从句为一般过去时，主句用过去完成时 eg: By the time I got home，my mother had cooked dinner. 主句为一般将来时，从句中用一般现在时表将来 eg: He will be a teacher by the time he is twenty....