《(完整word版)初中英语If引导的条件状语从句.docx》由会员分享，可在线阅读，更多相关《(完整word版)初中英语If引导的条件状语从句.docx（8页珍藏版）》请在三一文库上搜索。
1、初中英语一一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ifnot。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
2、 let him down.如果你考试不及格，你会让他失望的。另外,if从句还表小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 = ifnot.除非，若不，除非在的时候例如：Lets go out for a walk unless you are too tired.=If you are not too tired, lets go out for a walk.Unless it rain
3、s, 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，我就桑看你。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。
4、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, goesC.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IF引导的一、表示将来可能发生的：(1) If sb does st
5、h, 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 sthIf 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弓I导的sb will do sthunless sb does sthif sb does not do st
6、h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 behiRdC句转换) you study hard, youfall behin
7、d.6.If you don t put on your scarf, you (同义句转换) ll catch cold.Put on your scarf, you ll catch cold.7.I don t know if ittomorrow) . (表 是否 ，用将来时态)If it,I won t go shopping. (rain)口果，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 (arri
8、ve) 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 msure if he (go) to the party, he (have) a greattime.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.1
9、4.If she (be) kind to me , I (not argue) with her.15.1 f 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 theclassroom?19 .He ll get better grad
10、es 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/agree
11、s) 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.
12、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 / dontired ? t/ doesn t) get9. 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)
13、fewer trees, there ( be) more pollution.5. If Marcia (live) alone, she ( keep) a petparrot.6. Lana ( buy) a new dress if the old one (be) out ofstyle.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
14、.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 grandparentsif he (get) his report card thisweek.14. If she (get) up late, she ( not catch) the ea
15、rly bus.15. Peter (major) in English if he (pass) the exams inPeking University.I .单项选择(15分)1.If you to the party, you ll have a great time. AB. wwilel ngto C. go D.going2. It will be a long time Peter his work.A. since, has finished B. after, finishes C. when, will finish D. before, finishes.3. Wha
16、t will father us from Japan? A. take B. bring C. carry D. make4. Weifang is famous kites. A. for B. to C. on D. with5. I her the answer if she me.A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks6. - What are you going to do tomorrow?-We ll go to the library tomorrow
17、 if it _.A. isn t raiBn. rain C. won t rainD. doesn t rain7. Do you know when he will come back tomorrow?-Sorry, I don t know. When he backe,llIyou. ll tA. comes B. will come C. come D. may come8. What will you do if you to the old folk s home visit?A. go B. went C.going D. will go9. If I eat food, I ll be very fat.A. too many B. many too C. too much D. much too10. I ll give the book to him if he _ here next Sunday.A. will come B. comes C. is coming D. came1-5 CDBAD6-10 DAACB11-15