初中英语条件状语从句语法详解(名师剖析语法知识点+ 实战训练题，值得下载打印)一．条件状语从句的概念条件状语从句，即在某种条件下，一件事情可能发生。

在英语中由连接词if或unless等引导的状语从句叫做条件状语从句。

条件是指某一件事情实现之后（状语从句中），一件事情（主句）才能发生，通常译作“假如，只要，如果”等意思。

条件状语从句中，主从句的时态要遵循“主将从现”的原则。

即，主句是将来时态时，从句用一般现在时代替将来时态。

二.条件状语从句的引导词1.If conj . 如果，假如If you ask him，he will help you．如果你请他帮忙，他会帮你的。

If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。

2.unless conj.除非,若不,除非在……的时候（if ...not...）You will fail to arrive there in time unless you start earlier. 如果你不早点动身,你就不能及时赶到那儿。

Unless it rains, the game will be played. 除非下雨,比赛将照常进行。

3.so/as long as conj.只要You may borrow my book as long as you keep it clean.只要你保持书的清洁，你就可以把我的书借去。

三．关于条件句的时态，常见的有以下三种情况：1、条件状语从句的主句是一般将来时，那么从句常常用一般现在时。

When I grow up, I’ll be a nurse and lo ok after patients. 我长大后要当一名护士，照顾病人。

2、如果主句是祈使句，那么从句通常要用一般现在时。

If you want to have a chat ,call me up. 如果你想聊天，打我电话。

3、如果主句是含有情态动词时，根据需要从句多用一般现在时。

You should be quiet when you are in the reading room. 在阅览室时应保持安静。

四．知识拓展1在以when，before，as soon as等引导的时间状语从句，也适用“主将从现”原则，即如果主句是一般将来时，从句则用一般现在时。

I'll tell her the good news when she comes back. 当她回来的时候，我将把这个好消息告诉她。

she will give you a call as soon as she returns. 她一回来就会给你电话。

2.If条件句的同义句：祈使句，and /or+将来时态的陈述句。

Work hard ,and you will make great progress.=If you work hard, you will make great progress. 如果你努力学习，你才会取得大的进步。

Hurry up, or you will be late.=If you don’t hurry up. You will be late. 如果你不快点，你就要迟到了。

条件状语从句练习精讲（含答案）Ⅰ.单项选择1. If you _____ to the party, you’ll have a great ti me.A. will goB. wentC. goD. going2. It will be a long time ____ Peter _____ his work.A. since, has finishedB. after, finishesC. when, will finishD. before, finishes.3. What will father _____ us from Japan?A. takeB. bringC. carryD. make4. Weifang is famous ______ kitesA. forB. toC. onD. with5．I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks6. – What are you going to do tomorrow?--We’ll go to the library tomorrow if it ___.A. isn’t rainB. rainC. won’t rainD. doesn’t rain7.—Do you know when he will come back tomorrow?--Sorry, I don’t know. When he ____ back, I’ll tell you.A. comesB. will comeC. comeD. may come8. What will you do if you _____ to the old folk’s home visit?A. goB. wentC. goingD. will go9. If I eat ____ food, I’ll be very fat.A. too manyB. many tooC. too muchD. much too10. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came11. There ____an English film in our school tomorrow.A. is going to haveB. will haveC. is going to beD. has12. Could you tell us where ____？A. will the next Olympic Games heldB. the next Olympic Games will be heldC. would the next Olympic Games be heldD. the next Olympic Games would be held13. When my mother returned last night, I ____ a book.A. readB. am readingC. was readingD. am going to read14. What ____ you ____ when it began to rain?A. do, doB. were, doingC. are, doingD. did, do15. I’ll wake you up when he ____back.A. willB. is going to comeC. comesD. comeAnswers：1---5 CDBAD 6---10 DAACB 11---15 CBCBC二、用所给词的适当形式填空1. If you ________(feel) tired, you _________ (have) to have a rest.2. Where _____ he ____(see) the film if he _________(have) time?3. If there ____ (be) fewer trees, there _______ (be) more pollution.4. He ___ (dress) more casually if he ___ (not work) on weekends.5. If Marcia _______ (live) alone, she _______ (keep) a pet parrot.6. Lana _____ (buy) a new dress if the old one ____ (be) out of style.7. The twins _______ (fight) if they__________ (argue).8. I ______ (have) a bake sale if I ____ (need) money for education.9. Peter ____ (send) me a beautiful souvenir if he ____(visit) Spain.10. If Mr. Green _______ (say) I am hard- working, my parents ___ (feel) glad.11. I ______ (go) to the beach if it________ (not rain) this week.12. _____they ___ (have) a match if the P.E. teacher __ (be) busy?13. He ____ (write) a letter to his grandparents if he ____ (get) his report card this week.14. If she ______ (get) up late, she _____ (not catch) the early bus.15. Peter ____ (major) in English if he ____(pass) the exams in Peking University.Answers：1 feel，will have2 will see has3 are, will be4 will dresses, doesn’t work5 lives, will keep6 will buy, is7 will fight, argue8 will have, need9 will send, visits 10 says, will feel 11 will go, doesn’t rain12 Will have is 13 will writes, gets 14 gets, won’t 15 will major, passesIII完成句子1.如果他到得晚了，会发生什么事情？What _______________ if he _____________ late?2. 如果努力学习，你就会取得好成绩。