after + 时间段, ……之后,多用于过去时。如:My father told me the truth after 3 days. 父亲三天后告诉了真相。
after + 时间点:多用于过去时和将来时态:如: I went home after 3 o'clock.
He will be back after 3 o'clock.
in + 时间段多用于将来时态: He will be back in 3 hours. 他将在3小时后回来。
as soon as 一……就…… 引导从句,因此它的前后都为句子:如: I will tell her about it as soon as she comes back. 多见于主将从现的句子中。
until表于前面的动作一直持续到后面的时间为止。如:I slept until 9:00.我睡到9:00。(我直到9:00才没睡了)。
I didn't get up until 9:00.我直到9:00才起床。
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