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状语从句的析与练
用来修饰主句中的动词，形容词或副词等而充当状语的从句叫做状语从句。状语从句常用从属连词来引导，与主句连接起来。若置于句末，则前面不加逗号。根据意义和作用，状语从句可分为时间原因条件等几种。下面我们就来分析一下这几种状语从句。
1 时间状语从句
时间状语从句常用从属连词when, after, until,
as soon as, 等来引导。
当主句是祈使句或谓语动词是一般将来时态或情态动词时，其时间状语从句中的谓语动词常用一般现在时态表示将来发生的动作或存在的状态。这就是我们常说的“主将从现”。
如：Please call me when you get there.
当你到那时，请给我打个电话。
I
will write to you as soon as I arrive in Beijing.
我一到北京就给你写信。
<温馨提示> since
引导时间状语从句表示“自从…以来”，从句中的动词一般表示动作的起点，用过去时；而主句的动作延续的情况则用一般现在时或现在完成时。常用的句型为：
It has
been/ is + 一段时间+ since + 过去时。
如：I has been/ is three years since we met last
time. 自从我们上次见面，已经三年了。
2 条件状语从句
引导条件状语从句的连词或词组有：if （如果), unless（除非）, as long
as（只要）等。如果主句是将来时，条件状语从句也用一般现在时来表示。
如：I will stay at home if it rains
tomorrow. 如果明天下雨，我就待在家。
You
can’t learn English well unless you work
hard.
除非你努力学习，否则是学不好英语的。
<温馨提示> 由if
引导的条件状语从句，若从句表达的是与现在事实相反的事实，则常用虚拟语气，即用过去时态表示（如果涉及到be动词，一律都用were）。此时，主句则用过去将来时。
如：If I had enough money, I would buy it for
you. 如果我又足够的钱，我将把它买给你。
I
wouldn’t do it if I were you.
如果我是你，我是不会做的。
3 原因状语从句
because, since, as, for 都可用来引导原因状语从句，那么它们又有哪些区别呢？
① because 用来表示“造成某种结果的直接原因”，语气较浓，常用来回答why提出的问句。如：
--- Why are you late?
--- Because my bike is
broken.
② as 和since用来表示“看的到的或是不说也知道的原因”，since 也可译作：“既然”。
如：As he is old enough, let him do it.
他既然长大了，就让他干吧！
Since his
shoes are worn out, let’s buy him a new pair.
既然他的鞋坏了，那我们就给他买双新的吧。
③ for 引导的原因状语从句不置于句首，常用来表示“顺便提及的理由”，只是稍带说明原因，并非强调。
如：I must stay here, for it’s raining so
hard. 我必须得待在这儿，因为雨下的很大。
当然，除了以上提到的几种状语从句之外，我们还学过由than 引导的比较状语从句，由so …that
引导的结果状语从句等。在具体作题时，只要保持清醒地头脑，仔细地审题，冷静的分析，相信会取得好成绩！怎么样，来几道练习题挑战一下吧！
真题链接
（ ）1. You’ll do much better _____ you’re more
careful with your spelling.
A.
if B.
before C.
although D.
unless （2006
陕西）
（ ）2. _____ you told me, I heard nothing of
what happened.
A.
Until B.
After C.
If
D.
Since
（2006 潍坊）
（ ）3. I don’t understand the text______ there
are few new words in it.
A.
so B.
because C.
if D. though
（2006 青岛）
（ ）4. I sit in the front of the classroom
______ I can hear clearly.
A.
so that B. when
C. in
order （2006 青海）
（ ）5. ---Come and join us,
Jimmy!
--- I’m sorry, but I ‘m really busy now. If I
______time, I would certainly go.
A.
will have B. have
had C.
had D.
have （2006 河南）
（ ）6. --- Would you please give this message
to Jay when he _________?
---
Yes, I will.
A.
will come B. would
come C.
comes D. is
coming （2006 杭州）
（ ）7. If you don’t go to the meeting
tomorrow,_________.
A.
he will, too
B. he won’t,
either
C. he does, too
D. he
doesn’t,
either
（2006 重庆）
（ ）8. ---Did David go to school yesterday?
---No, ______he had a bad cold.
A. because
B.
if
C.
though
（2006 佛山）
（ ）9. Most people ______when the big
earthquake took place in that area.
A.
are sleeping B. were
sleeping C. slept
D.
sleep. （2006 上海）
（ ）10. If _______sunny tomorrow, I________
fishing in South Lake.
A.
is, go B.
will be, go C. is, will
go D. will be, will go （2006
昆明）
大显身手
单项选择
（ ）11.I know nothing about the news _____ my
friend told me yesterday.
A. because B.
since C.
until D. after
（ ）12. I will tell him if I _______ him.
A.
saw B. will
see C.
seeing D. see
（ ）13. I am sleepy ______ I didn’t sleep well
last night.
A.
when B.
that C.
because D. so
（ ）14. They won’t be back until the
work________.
A.
do B.
does C. is
done D. will do
（ ）15.--- When will you call me?
---
I will call you as soon as _______ in Shanghai.
A. arrive
B.
arrives C.
arriving D. will arrive
（ ）16. I’ll go to cinema this
Sunday_________.
A.
if it will be sunny
B.
if I’m free
C.
when I have no time D. because
I’m busy.
（ ）17. Don’t worry. I’ll tell Mrs. White
_____she comes back.
A.
when B.
how C.
why D. where
（ ）18. _______he studies hard, _______he
doesn’t pass the exam.
A.
Though, but B. Though,
/ C. But,
Though D. But, /
（ ）19. It has been two months since I ______my
hometown.
A.
leave B. will
leave C.
left D. have left
（ ）20. The coat is ______ expensive _____ I
can’t afford it.
A. such, that
B. so,
but C. so,
that D. such, that
句型转换
21. Wang Xiao didn’t go to school. She had a
fever. （合并为一个复合句）
Wang Xiao didn’t go to
school _________she had a fever.
22. If you don’t study hard, you won’t pass the
exam. （改为同义句）
You won’t pass the exam
_______ you study hard.
23. I am 15. My brother is 13. （合并为一个复合句）
I am two years older
________my brother.
24. It’s raining heavily, but I still go to
school. （改为同义句）
I still go to school
_________ it’s raining heavily.
25. It is three years since I joined the army. （改为完成时态）
I have ________ ________
the army for three years.
翻译句子
26. I will show him the new book as soon as he
_______________. （到这儿来）
27. What will she do when she _____________?
（长大）
28. We will go out to play if it _____________
tomorrow. （不下雪）
29. While my mother ____________, someone knocked at the
door. （做饭）
30. Turn off the lights before you __________________.
（离开教室）
练习题参考答案
1-5 AADAC
6-10 CBABC
11-15
CDCCA
16-20
BABCC
21. because
22. unless
23.
than
24.
though / although
25. been
in
26. comes here 27. grows
up 28. doesn’t
snow 29. was
cooking 30. leave the
classroom
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