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上海牛津版6B语法-条件状语从句+时间状语从句讲解及提升练习
一、条件状语从句
if 假如; 如果; 倘若; 要是 I. 从属连词:
unless II. if的用法
① if(如果) 引导条件状语从句:时态多遵循主将从现的原则 e.g. If it doesn’t rain, we will go to the park next Sunday. If you ask him, he will help you.
② if(是否) 引导宾语从句:时态需根据具体情况而定 e.g. He asked whether/if we wanted a drink.
He didn't know whether/if we should write or phone.
III. unless 的用法
unless和if...not的用法常常是相同的: e.g. You'll fail in French unless you work harder.
Unless England improve their game , they're going to lose the match. 练习:
I. Multiple Choices 选择最佳答案
1. If it _______ fine tomorrow, I will go hiking with you.
A. is
B. was
C. will be
D. being
如果不…就…;除非…否则… =if not
2. I like summer best among the four seasons, __________ I can enjoy the long summer
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vacation. A. but
B. because
C. so
D. Though
3. You can't learn English well ____________ you practice more.
A. if
B. because C. unless D. after
4. Don't let such a thing happen again, ________ you will lose your job!
A. and
B. but C. or D. so
5. —Do you know if he________ to play football with us?
—I think he will come if he _________ free tomorrow. A. comes; is
B. comes; will be C. will come; is
D. will come; will be
6. ______ you improve your writing, you’ll lose marks in the exam.
A. Before B. Because
C. Unless D. if
7. Online games are very interesting, ________we can’t spend too much time on it.
A. and
B. or
C. so
D. but
8. You will stay healthy ________ you do more exercise, such as running and walking.
A. before
B. if C. though D. until
9. Try your best, ____________ you will make great progress in your English study.
A. but B. if C. or D. and
10. I don’t know if his uncle __________. I think he __________if it doesn’t rain.
A. will come; comes C. comes; comes
II. Sentence Rewriting 改写句子
1. Work harder, or you'll not succeed in your new job. (保持句意基本不变)
________ ________ work harder, you'll not succeed in your new job. Unless you 2. I shall leave the restaurant if the waiter doesn’t come soon. (保持句意基本不变)
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B. will come; will come D. comes; will come
I shall leave the restaurant ________ the waiter ________ soon. unless…comes 3. Unless you clean your teeth regularly, you will get toothache. (保持句意不变)
________ you clean your teeth regularly, you will get toothache. If… don’t 4. If you don't clean your teeth regularly, you will get toothache. (保持句意基本不变)
You________ get toothache________ you clean your teeth regularly. will…unless 5. You will be unhealthy if you don't do exercise regularly. (保持句意基本不变)
You will be unhealthy________ you ________ exercise regularly. unless…do
二、时间状语从句 when 当…的时候 I. 从属连词: 连接两个或两个以上的分句。
as soon as 一…就…
II. When的用法
1) 作为疑问副词,引导特殊疑问句,意为“什么时候; 何时”。 e. g. When will they come back?
2) 作为连词,引导时间状语从句。主将从现
① When Summer comes, We will go to the beach. ② When I was in Japan, I bought some beautiful pearls. ③ When I reached the station, the train had left. ④ He was still smiling when his wife came in.
【知识拓展】:
While表时间的用法
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