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 1 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) 2 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 3 本文来源：https://www.wddqw.com/doc/be8a39dece7931b765ce0508763231126fdb7793.html