陷阱2 用错条件状语从句的时态
当主句为将来时态或具有将来意时，条件状语从句通常要用一般现在时表示将来意义，而不能直接使用将来时态。如：
如果明天下雨我们就呆在家里。
误：We’ll stay at home if it will rain tomorrow.
正：We’ll stay at home if it rains tomorrow. (http://ask.hxen.com/)
注意，有时也可见到 if you will 这样的说法，但那不是将来时态，而是表示意愿或委婉的请求(此处的 will是情态动词)。如：
If you will follow me, I’ll show you the way. 请跟我来，我给你指路。
【强化训练】
选择最佳答案填空：
1. —Look! Here comes our school bus.
—No hurry. Don’t get on it ________ it has stopped.
A. until B. after C. since D. when
2. ________ the story is short and there are no new words in it, it is difficult to understand.
A. But B. Though C. And D. For
3. The red suitcase is expensive ________ it’s made of leather.
A. when B. if C. because D. though
4. He met many problems ________ he was going over his lessons.
A. before B. as soon as C. since D. while
5. The little boy ate a big meal ________ he said he wasn’t hungry.
A. if B. though C. because D. as
6. —What is our head teacher like, do you know?
—Oh, he is very kind ________ he looks very serious.
A. because B. though C. if D. when
7. —What do you think of her dress?(http://ask.hxen.com/)
—I think it still looks quite fashionable on her ________ it is a style of many years ago.
A. though B. or C. so D. because
8. ________ hamburgers are junk food, many children like them.
A. If B. Unless C. Because D. Although
9. —Tommy, do you know if Frank ________ to the zoo this Sunday if it ________?
—Sorry, I have no idea.
A. will go; is fine B. goes; is fine
C. will go; is going to be fine D. goes; will be fine
10. I will call you as soon as I ________ the ticket to the football match.
A. will get B. get C. got D. am getting
11. —David, turn off the TV ________ no one is watching it.
—But it ________ off already！The music is from the radio.
A. so that, has been turned B. when, has turned
C. if, has been turned D. because, has turned
12. —You will fail the exam ________ you don’t work hard.
—OK, I’ll try my best. (www.hxen.com)
A. and B. though C. but D. if
13. Tom knew nothing about it ________ his sister told him.
A. since B. if C. until D. when
14. I can’t still understand the passage ________ there are few new words in it.
A. so B. because C. if D. though
15. She has studied in this school ________ she was seven years old.
A. since B. if C. until D. after