立身以立学为先，立学以读书为本 初中英语――条件状语从句（讲解&练习） Ⅰ条件状语从句的定义 Ⅱ条件状语从句的引导词 1.if引导的条件状语从句 表示在某种条件下某事很可能发生。 If we pay much attention to the earth, we'll have a better world. 如果我们多关爱地球，就会拥有一个更美好的世界 If it rains tomorrow, what shall we do? 如果明天下雨，我们怎么办？ 注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。 What would happen if there were no water ? 如果没有水会怎样？ 2.unless引导的条件状语从句 unless的意思是如果不，除非。可与if...not互换。 You will fail in English unless you work hard. 你英语考试会不及格的，除非你更加努力。 3.as /so long as引导的条件状语从句 as /so long as意思是“只要” So long as you're happy,i will be happy. 只要你高兴，我就高兴。 Ⅲ条件状语从句的种类 Ⅳ条件状语从句的时态原则 条件句 从句 主句 一般将来时 真实 一般现在时 情态动词+动原 祈使句 一般过去时 非真实 would/could+动原 be动词用（were） 注意 ： 学习" if " 引导的条件状语从句的用法,现在总结一下: if 条件句不一般,几个要点记心间; 条件句,放在前, 逗号要放句中间。 条件句表真实，主将从现要遵从； 条件句非真实，虚拟语气用到位。 立身以立学为先，立学以读书为本 练习 Ⅰ.单项选择 （ ）1.If you _____ to the party, you’ll have a great time. A. will go B. went C. go D. going （ ）2. I ____ her the answer if she ____me. A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks （ ）3. – What are you going to do tomorrow? --We’ll go to the library tomorrow if it ___. A. isn’t rain B. rain C. won’t rain D. doesn’t rain （ ）4. What will you do if you _____ to the old folk’s home? A. go B. went C. going D. will go （ ）5．I’ll give the book to him if he ___ here next Sunday. A. will come B. comes C. is coming D. came Ⅱ.用所给词的适当形式填空 6..If you ________(feel) tired, you _______________ (have) to have a rest. 7. Where _______ he _________(see) the film if he ________________(have) time? 8. If there __________(be) fewer trees, there _______________( be) more pollution. 9. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot. 11. Lana ________________( buy) a new dress if the old one ____________(be) out of style. 12.The twins ______________(fight) if they_______________(argue). 13. I ____________(have) a bake sale if I _____________(need) money for education. 14. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain. 15. I ____________(go) to the beach if it________________ ( not rain) this week. 17. __________they __________( have) a match if the P.E. teacher _____________(be) busy? 18. If she ____________(get) up late, she _____________ ( not catch) the early bus. Ⅲ.翻译下列句子 19..如果他到的晚了会发生什么事情？ What _______________ if he _____________ late? 本文来源：https://www.wddqw.com/doc/1b4e48415aeef8c75fbfc77da26925c52cc591da.html