（十）使用状语从句时要注意的几个问题
1、在时间和条件（有时也在方式、让步等）从句中，主句是一般将来时，从句通常用一般现在时表示将来。
e.g. We’ll go outing if it doesn’t rain tomorrow. I’ll write to you as soon as I get to Shanghai. 2、有些时间、地点、条件、方式或让步从句，如果从句的主语与主句主语一致（或虽不一致，是it），从句的谓语又包含动词be ，就可省略从句中的“主语 + be”部分。
e.g. When (he was) still a boy of ten, he had to work day and night.If (you are) asked you may come in. If (it is) necessary I’ll explain to you again. 3、注意区分不同从句：引导的是什么从句，不仅要根据连词，还要根据判别。以where为例，能引导多种从句。
e.g. You are to find it where you left it.（地点状语从句） （定语从句，句中有先行词） I don’t know where he came from.（宾语从句） （主语从句） This place is where they once hid.（表语从句）
选择填空：
1. I’ll let you know ____ he comes back.
A. beforeB. because C. as soon as D. although
2. She will sing a song ____ she is asked.
A. if B. unlessC. forD. since
3. We will work ____ we are needed.
A. whenever B. because C. sinceD. wherever
4. Read it aloud _____ the class can hear you.
A. so thatB. if C. when D. although
5._____ you go, don't forget your people.
A. WheneverB. However C. Wherever D. Whichever
6. It is about ten years _____ I met you last.
A. since B. forC. when D. as
7. They will never succeed, _____ hard they try.
A. because B. however C. when
8. _____ still half drunk, he made his way home.
A. WhenB. Because C. Though
9. _____ she was very tired, she went on working.
A. AsB. Although C. Even
10. Busy _____ he was, he tried his best to help you.
A. asB. whenC. since
11. I learned a little Russian _____ I was at middle school.
A. though B. although C. as if
12. _____ we got to the station, the train had left already.
A. If B. UnlessC. Since
13. _____ the rain stops, we' 11 set off for the station.
A. BeforeB. UnlessC. As soon as
14. She was _____ tired _____ she could not move an inch.
A. so, that B. such, that C. very, that
15. We didn’t go home _____ we finished the work.
A. since B. untilC. because
16. I'll stay here _____ everyone else comes back.
A. even if B. as though C. because
17. Although it's raining, _____ are still working in the field.
A. they B. but they C. and they
18. Speak to him slowly _____ he may understand you better.
A. since B. so thatC. for
19. You'll miss the train ______ you hurry up.
A. unlessB. asC. if
D. since D. As D. In spite of D. for D. when D. When D. Though D. so, as D. though D. until D. so they D. because D. until
20. When you read the book, you' d better make a mark _____ you have any questions.
A. at which B. at where C. the place D. where
21. We'd better hurry ______ it is getting dark.
A. andB. butC. asD. unless
22. I didn' t manage to do it _____ you had explained how.
A. untilB. unlessC. whenD. before
23._____ he comes, we won't be able to go.
A. Without B. UnlessC. ExceptD. Even
24. I hurried _____ I wouldn't be late for class.
A. since B. so thatC. as if D. unless
25. _____ I catch a cold, I have pain in my back.
A. Every time B. Though C. EvenD. Where
26. What's the matter _____ they still haven't answered the telegram?
A. when B. thatC. thoughD. however
27. Bring it nearer _____ I may see it better.
A. although B. even though C. so thatD. since
28. You may arrive in Beijing early _____ you mind taking the night train.
A. thatB. thoughC. unlessD. if
29. Helen listened carefully _____ she might discover exactly what she needed.
A. in thatB. in order that C. in caseD. even though
30. More people will eat out in restaurants _____ they do today.
A. thanB. whenC. whileD. as
31._____ hard she tries, she can hardly avoid making mistakes in her homework.
A. Much B. However C. AsD. Although
32. Poor _____ it may be, there is no place like home, _____ you may go.
A. as; wherever B. though; whenever C. in spite of; when D. that; wherever
33. The child was __ immediately after supper.
A. enough tired to go to bed
C. so tired that he went to bed
B. too tired to go to bed D. very tired, he went to bed