2020-2021学年牛津上海版六年级下册语法-条件状语从句+时间状语从句讲解及提升练习（有答案）

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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 如果不…就…；除非…否则… =if not

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

2. I like summer best among the four seasons, __________ I can enjoy the long summer

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 B. will come; will come

C. comes; comes D. comes; will come

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)

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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2020-2021学年牛津上海版六年级下册语法-条件状语从句+时间状语从句讲解及提升练习（有答案）

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