<一> 例句
Once you've finished, go to bed.
一干完，你就睡觉去吧。
<二> 语法分析
英语中有大量的时间状语从句，多由连词引导，也有一些时间状语从句不由连词引导。从句可以位于句首、句中或句末。状语从句按意义可以分为时间状语从句、地点状语从句、原因状语从句、让步状语从句、目的状语从句、条件状语从句、结果状语从句、方式状语从句以及比较状语从句等。
<三> 触类旁通
(1)On and on he went, till he reached the outskirts of the wood.
他走了又走，直到走到林子边。
语法分析：大量的时间状语从句，多由连词引导。
(2)If I were you, I'd go to school tomorrow.
我要是你，明天就去上学。
语法分析：条件状语从句多由if 或unless 引导，if有时可以省略，而把从句的语序倒装。
(3)So many people came to the concert that some couldn't get in.
那么多人来听音乐会，以至有些人无法进来。
语法分析：结果状语从句多由so that, so...that, such...that以及that等引导。
(4)Where others are weak, he is strong.
别人的弱点正是他的优势。
语法分析：where 引导的从句，除了表示地方外，还可以表示处境等，可有多种含义。
(5)Some prased him, whereas others condemned him.
有些人赞扬他，而另一些人却谴责他。
语法分析：although, though, while, whereas等多引导让步状语从句
(6)Since I haven't got her address, I can't write to her.
因为我没有她的地址，所以我无法给她去信。
语法分析：原因状语从句多由because, as, since, in case等引导。
<巩固练习>
1. I had been less cautions, I might have been more wise.
2. I show everything on my face, I'm angry or pleased.
3. My father has bought me a bicycle that I can get to school.
4. The situation is such agreement is unlikely.
5. Drink this, you will be sick.
6. [see] he refused to help us, there's no reason why we should now help him.
7. as I would like to come. I cannot.
8. I live there were plenty of sheep.
9. She is as tall her father.
参考答案：
1. If 2. whether 3. so 4. that 5. else
6. Seeing 7. Much 8. Where 9.as
