初中英语if引导的条件状语从句

初中英语if引导的条件状语从句 初中英语――if引导的条件状语从句 在 if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面， 若 if 条件句放句首， 从句后面要加逗号，和主句隔开。还要注意前后时态一 致原则.引导条件状语从句的连接词主要有:if(如果)、unless(除非)或 as long as(只要)等。unless在意思上等于if...not。 一、条件状语从句用法 1、引导条件状语从句最常用的连词是if,由if引导的条件状语从句 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 示在某 种条件下某事很可能发生。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。 另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚 拟的条件或假设,从句多用一般过去时或过去完成时。如: If I were you, I would invite him to the party. 如果我是你,我会邀请他参加聚会。 2、unless = if...not. 除非,若不,除非在……的时候 例如:Let's go out for a walk unless you are too tired. =If you are not too tired, let's go out for a walk. Unless it rains, the game will be played. 除非下雨,比赛将照常进行。 二、时态问题 在条件状语从句中，要注意―主将从现‖的规定，即主句用一般将来时，从 句用一般现在时表示将来时。例句: I will come to see you if I have time. 我有时间，我就来看你。 三 如果 if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从 句大多用一般现在时态。如: If bears are in danger ,they attack people. 误区提醒 if 既可以引导条件状语从句，表示―如果‖，也可以引导宾语从句，表达―是 否‖。辨别它在这两种从句中的时态是我们经常容易出错的地方。另外，if 和 unless的用法也需注意。 典型例题: ----I wonder if your wife to the party. ----If your wife _________, so will mine。. A. will go， go B. will go, goes C.goes, will go D. will go, will go 解析:第一句中if表示―是否‖，引导宾语从句，用将来时will go;第二句―如 果你的妻子去，我的妻子也去‖，if引导条件状语从句，用一般现在时表示将来 时。 your wife，单三人称主语，所以用goes 。 总结 初级经济法重点总结下载党员个人总结TXt高中句型全总结.doc高中句型全总结.doc理论力学知识点总结pdf IF引导的 一、表示将来可能发生的: (1) If sb does sth, sb will do sth = sb will do sth if sb does sth 主句一般将来时 从句一般现在时 (2)主句为祈使句或情态动词形式 If sb does sth, please do sth If sb does sth, sb may(情态动词) do sth 二、表必然发生的 If sb does sth, sb/sth does sth = sb/sth do sth if sb does sth 主句一般现在时， 从句一般现在时(相当于when引导的从句) Unless引导的 sb will do sth unless sb does sth if sb does not do sth 练习 1.He ______ (fail) in the exam if he ______ (not study) hard. 2.Unless you ______ (leave) now, you ______(be) late. 3.We ______ (have) a barbecue unless it ______ (rain) . 4.Hurry up, or you will miss the bus.(同义句转换) ___ you don’t hurry up, you ____ catch the early bus. 5.Study hard, or you’ll miss fall behind. (同义句转换) ______ you study hard, you______ fall behind. 6.If you don’t put on your scarf, you’ll catch cold. (同义句转换) Put on your scarf, _____ you’ll catch cold. 7.I don’t know if it_______ tomorrow. )(表是否，用将来时态) If it ____ ,I won’t go shopping. (rain) (表如果，用现在时态) 8.I want to know if he _________(come) tomorrow, if he _______(come), I __________(give) the massage to him. 9. Please let us know if he ________(arrive) tomorrow. 请告诉我们他明天是否会来 Please let us know if he _________ (arrive) tomorrow. 如果他明天来的话请告诉我们 10.I’m sure if he _____(go) to the party, he________ (have) a great time. 11.If the rain _______(stop) tonight, we will go to the cinema. 12.I’ll buy a computer if I ______(have) enough money. 13.You _________(not get) nervous if you _____(do ) enough exercise. 14.If she ____ (be) kind to me , I __________(not argue) with her. 15.If you _____(pay) more attention to that, he _________ (not get) injured. 16.Mr Li will be mad if we _______(break) the rules. 17. If it _____ (be) cloudy, they _______(not go) there by air. 18.Shall I say ―Hello‖ when the foreigner ______(come) into the classroom? 19.He’ll get better grades if he _________ (study )hard. 20. If you work really hard, you _______ (be) famous and rich. if 条件状语从句的时态练习 一(在正确的答案下划一条线。 1.Daina ( will go/go/goes) to Europe if she (will pass/pass/passes) the exams . 2. The graduates (will teach/teach/teaches) in the poor village if the Ministry of Education (will agree/ agree/agrees) soon. 3. If a UFO (will land/land/lands) in front of me, I (will go/go/goes) in to look for the alien. 4. If he (will have/have/has) money, he (will bulid/build/builds) a science lab. 5.Don’t wait for me if I (am/ will be) late. 6.They (won’t/don’t) go to the beach if it (will rain/rain /rains). 7. I (will call/ call) you if he (will stay/stay /stays) at home. 8. (Will / Do/ Does) he visit the museum if he (won’t / don’t/ doesn’t) get tired? 9. Where (will/ do/does) they live if they (will miss/ miss/ misses) the bus? 二、用所给词的适当形式填空 1.If you ________(feel) tired, you _______________ (have) to have a rest. 3. If there __________(be) fewer trees, there _______________( be) more pollution. 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 ________________(tour) 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. ?.单项选择(15分) 1.If you _____ to the party, you’ll have a great time. A. will go B. went C. go D. going 2. It will be a long time ____ Peter _____ his work. A. since, has finished B. after, finishes C. when, will finish D. before, finishes. 3. What will father _____ us from Japan? A. take B. bring C. carry D. make 4. Weifang is famous ______ kites. A. for B. to C. on D. with 5( 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 6. – 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 7.—Do you know when he will come back tomorrow? --Sorry, I don’t know. When he ____ back, I’ll tell you. A. comes B. will come C. come D. may come 8. What will you do if you _____ to the old folk’s home visit? A. go B. went C.going D. will go 9. If I eat ____ food, I’ll be very fat. A. too many B. many too C. too much D. much too 10. I’ll give the book to him if he ___ here next Sunday. A. will come B. comes C. is coming D. came 1---5 CDBAD 6---10 DAACB 11---15