初中英语条件状语从句语法点和习题

1．常用引导词：if（如果），unless（除非）。

I won’t go to the movies unless I am free tomorrow.

除非我明天有空，否则我不会去看电影。

2．条件状语从句的位置

可放在句首或句尾，放在句首时常用逗号与主句隔开。

it rains tomorrow, I will stay at home.

= I will stay at home if it rains tomorrow.

如果明天下雨我就呆在家里。

3．if引导词用法

if引导的条件句有：真实条件句和非真实条件句两种。

真实条件句：表示在某种条件下某事很可能发生。

you ask him, he will help you.

如果你请他帮忙，他会帮你的。

4．unless引导词用法

固定搭配：unless=if...not 除非，若不，如果不

will fail to arrive there in time unless you

start earlier.

=If you don’t start earlier, you will fail to

arrive there in time.

如果你不早点动身，你就不能及时赶到

那儿。

注意：在含有条件状语从句的复合句中，当主句是一

般将来时态，从句要用一般现在时（即主将从现原

则）。如果主句是祈使句或含有情态动词时，从句也

用一般现在时表将来。

you study hard, you will pass the exam.

1. I will send you an e-mail as soon as I ____ A___ in Canada.

A. arrive

B. arrived

C. am arrivi ng

D. will arrive

2. If there ____A___ no buying and selling of an imals, there ______ no killing in nature.

A. is; will be

B. will be; will be

C. is; is

D. will be; is

3. I’m waiting for my , I'll go shopping alone.

A. If she comes

B. If she won't come

C. If she doesn't come

5. You can’t watch TV ___A_____ you finish your homework.

A. unless

B. if

C. while

D. as

students _____A___ have a sports meeting this we

ekend if it ___.

A. won’t; rains

B. will; rains

C. won’t; will rain

D. are going to; is go ing to rain

9. I don't know if she ____B___ to my birthday party tomorrow. If she ______, I'll be very hap py.

A. comes; comes

B. will come; comes

C. comes; will come

10. —When will you come to Daqing? —I wil l call you ___D__I arrive.

A. till

B. while

C. as quickly as

D. as soon as

11. I’ll give it to Jim as soon as I ___C____ him to morrow.

A. saw

B. will see

C. see

D. have seen