when…
在帶before/while/after的句子中,情況也類似:
Always look both ways before you cross the road.
Before you cross the road, always look both ways.
While I was waiting for the bus, it began to rain.
It began to rain while I was waiting for the bus.
He never played football again after he broke his leg.
After he broke his leg, he never played football again.
when I am… / when I go… 等
一般現在時 (I am / I go 等) 用於when 之後表示將來:
When I get home this evening, I’m going to have a shower.
I can’t talk to you now. I’ll talk to you later when I have more time.
before / while / after / until 用法也類似:
Please close the window before you go out.
Rachel is going to stay in our fat while we are away.
I’ll wait here until you come back.