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从…冲出来
捎…一程
在（某时间点）以前
be late for class
in line with
keep sleeping
by the time
put on
rush out of
give …a lift
by the end of
By the time she got up, her brother had already gotten in the shower.
By the time she went outside, the bus had already left.
When she got to school, she realized she had left her backpack at home.
The important sentences
1.构成：主+_____+___________
had
V过去分词
2.过去完成时常与______________________等引导的时间状语连用。
when, by the time , before, by
过去完成时表示在过去某个时间或动作之前已经发生或完成了的动作或存在的状态，即“过去的过去（ past-in-the-past ）”。
7 o’clock
8 o’clock
now
the bus had left
went outside
had left … at home
got to school
By the time she went outside, the bus had already left.