條件狀語從句-初二英語

1、20151220條件狀語從句條件狀語從句1、定義、定義由引導(dǎo)詞if或unless引導(dǎo)的狀語從句叫做條件狀語從句。在英文中，條件是指某一件事情實現(xiàn)之后(狀語從句中的動作)，其它事情(主句中的動作)才能發(fā)生，通常譯作“假如“。(注意:在含有條件狀語從句的復(fù)合句中，表示將來時態(tài)，主句是一般將來時態(tài)祈使句或謂語動詞是情態(tài)動詞，從句要用現(xiàn)在時態(tài)即[主將從現(xiàn)原則]。Eg1:Takethemedicineyouwillbefine.Eg2:Ifyou

2、canreadasmanyEnglishbooksaspossibleyourEnglishwillbeimproved.2、用法、用法語法引導(dǎo)條件狀語從句最常用的連詞是if由if引導(dǎo)的條件狀語從句表示在某種條件下某事很可能發(fā)生if引導(dǎo)的條件狀語從句既可以將從句放前面也可以將從句放后面。除了if之外，還有其他連詞也可以引導(dǎo)條件狀語從句。【注：在條件狀語從句中，絕大數(shù)情況下some要變?yōu)閍ny。】(1)unlessconj.除非，若不，除

3、非在……的時候Eg1:Youwillfailtoarrivethereintimeunlessyoustartearlier.如果你不早點動身，你就不能及時趕到那兒。Eg2:Unlessitrainsthegamewillbeplayed.除非下雨，比賽將照常進(jìn)行。(2)oncondition(that)...在……條件下，如果oncondition(that)...引導(dǎo)的條件從句是主句事件發(fā)生的前提條件或唯一條件。Eg1:Icante

4、llyouthetruthonconditionthatyoupromisetokeepasecret.我可以告訴你真相，條件是你答應(yīng)保密。Eg2:Youcangoswimmingoncondition(that)youdontgotoofarfromtheriverbank.你只有在不遠(yuǎn)離河岸的條件下才可以下水游泳。Attention（注意）（注意）：①unless=if...not.Eg:Letsgooutfawalkunlessy

5、ouaretootired.Ifyouarenottootiredletsgooutfawalk.②if引導(dǎo)的條件句有真實條件句和非真實條件句兩種：真實條件句Eg：Ifitrainstomrowwewon’tgoonapark9.I’llgivethebooktohimifhe___herenextSunday.A.willcomeB.comesC.iscomingD.came10.There____anEnglishfilminour

6、schooltomrow.A.isgoingtohaveB.willhaveC.isgoingtobeD.has11.Couldyoutelluswhere____？A.willthenextOlympicGamesheldB.thenextOlympicGameswillbeheldC.wouldthenextOlympicGamesbeheldD.thenextOlympicGameswouldbeheld12.Whenmymoth

7、erreturnedlastnightI____abook.A.readB.amreadingC.wasreadingD.amgoingtoread13.What____you____whenitbegantorainA.dodoB.weredoingC.aredoingD.diddo14.I’llwakeyouupwhenhe____back.A.willB.isgoingtocomeC.comesD.comeII.同義句轉(zhuǎn)換1.Ru

8、nfastyou’llbelatefschool._______you______________fastyou’llbelatefschool.2.Youcanbuythedictionaryifyoutakeenoughmoneywithyou.Takeenoughmoneywithyou_________________buythedictionary.3.Ifthereisnoairnoneofuscanlive.Noneofu

9、scanlive________________.Ⅲ、用所給詞的適當(dāng)形式填空1.Ifyou______(feel)tiredyou_____(have)tohavearest.2.Where_____he____(see)thefilmifhe_______(have)time3.Ifthere____(be)fewertreesthere____(be)mepollution.4.He___(dress)mecasuallyifhe_

10、__(notwk)onweekends.5.IfMarcia______(live)aloneshe_______(keep)apetparrot.6.Lana___（buy）anewdressiftheoldone___(be)outofstyle(過時).7.Thetwins______(fight)（打架）ifthey_____(argue).8.Peter____(send)meabeautifulsouvenir（紀(jì)念品）if

11、he____(tour)Spain.9.IfMrGreen_______(say)Iamhardwkingmyparents___(feel)glad.10.I______(go)tothebeachifit______(notrain)thisweek.11._____they___(have)amatchiftheP.E.teacher__(be)busy12.He____(write)alettertohisgrparentsif