1 .状语从句很多，最常见的是时间状语从句，它们可由when, whenever, while, before, after, until, till, Since, now that, once, as soon as 等连词引起：
Let's wait until ( till ) the rain stop .
She comes to talk to me whenever she feels lonely.
As I talked, I gained some confidence.
Now that I have come back, I want to help you both.
Once the train is moving, there is no way to stop it.
2 .由every time, the moment 等词引起的从句也可以用追状语：
Every time I catch a cold, I have pain in my back.
Stormy applause broke forth the moment she appeared on the stage.
He had impressed me that way the first time I met him.
Be sure to call on us next time you come to town.
3. instantly, immediately, directly 等词也可引起时间状语从句：
Them achine will shart instantly you press the button.
I'11 give you an answer imediately I've finished reading your report.
Directly he uttered these words there was a dead silence.
1. I look after the children while my wife goes to London.
1. while my wife goes to London
2. I'll do it when I've finished writing the letter.
2. when I've finished writing the letter
3. Phone me after you get home.
3. after you get home
4. " I've cried till I can cry no more, " she said.
4. till I can cry no more
5. You can't get your license until you're eighteen.
5.until you're eighteen
6. You can come whenever you want.
6 . wherever you want
7. Once he realized what was meant, he would be furious.
7. Once he realized what
1. Next time you come, bring your daughter with you.
2. She asks after you every time she sees me.
3. We could use the car any time we liked.
4. He last time he was there, I criticized him for what he had done.
5. The moment she was gone, Irene sat down beside me.