初中英语初一-if条件句

if条件句【知识要点】定义：常见的if条件状语从句表示在某条件下， 某事很可能发生，条件是可能存在的，主句中某种情况发生的概率也是很高的。E.g.Ifyouaskhimhewillhelpyou.如果你请他帮忙，他会帮你的。E.g.Ifyoufailintheexam,youwilllethimdown.如果你考试不及格，你会让他失望的。E.g.Ifyouhavefinishedthehomeworkyoucangohome.如果你作业做完了就可以回家了。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， 表示对现在或过去的一种假设。E.g.IfIwereyou,Iwouldinvitehimtotheparty.如果我是你，我会邀请他参加聚会。E.g」wouldhavearrivedmuchearlierifIhadnotbeencaughtinthetraffic要不是交通堵塞，我本会来得早一些。另外你还要注意if条件句的时态搭配if从句用一般现在时，主句用一般将来时E.g.Ifherunshellgetthereintime.如果他用跑的，他就会及时赶到那儿。E.g.Thecatwillscratchyouifyoupullhertail.如果你拉猫的尾巴，它就会抓你。if从句用一般现在时，主句用may/might/canE.g.Ifthefoggetsthickertheplanemay/mightbediverted.如果雾在大一些，飞机可能就会改在别的机场降落。E.g.Ifitstopssnowingwecangoout.如果雪停了，我们就可以出去。if从句用一般现在时，主句用must/shouldE.g.Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想减肥，你必须少吃面包。if从句用一般现在时，主句用一般现在时E.g.Ifyouheaticeitturnstowater.也可用willturn)如果把冰加热，它就会化成水if从句用现在进行时，主句用一般将来时E.g.IfyouarelookingforPeteryo'lfindhimupstairs.如果你是在找彼得，上楼就会找到他。if从句用现在完成时，主句用一般将来时E.g.Ifyouhavefinisheddinner'askthewaiterforthebill.如果你吃完了，我就叫服务生来算账学习"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。条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。在if引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。如：E.g.Wecanwalkthereifwecan'tfindabus.E.g.Ifitrainstomorrow,wewillnotgotothezoo.E.g.Whatwillyoudoifyoufindapandaindanger.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。E.g.Ifbearsareindanger,theyattackpeople.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【经典练习】用所给词的适当形式填空1.Ifyou (feel)tired,you (have)tohavearest.Where he (see)thefilmifhe (have)time?Ifthere (be)fewertrees,there (be)morepollution.He (dress)morecasuallyifhe (notwork)onweekends.IfMarcia (live)alone,she (keep)apetparrot.Lana (buy)anewdressiftheoldone (be)outofstyle.Thetwins (fight)ifthey (argue).8.1 (have)abakesaleifI (need)moneyforeducation.Peter (send)meabeautiful souvenir ifhe (tour)Spain.IfMrGreen (say)Iamhard-working,myparents (feel)glad.I (go)tothebeachifit (notrain)thisweek. they (have)amatchifthePE.teacher (be)busy?He (write)alettertohisgrandparentsifhe (get)hisreportcardthisweek.Ifshe (get)uplate,she (notcatch)theearlybus.Peter (major)inEnglishifhe (pass)theexamsinPekingUniversity.翻译句子如果他到的晚了会发生什么事情？What ifhe late?如果努力学习，你就会取得好成绩。Ifyou ,you good .他如果看电视太久了，他的父母会不高兴。Ifhe TVtoomuch,hisparents unhappy.如果我们为他组织生日聚会，大家都会来的。Everyone ifwe abirthdayparty him.如果明天不下雨，我会和你一起去公园的。Ifit tomorrow,I gotothepark you.如果她睡过头了，就会旅游迟到的。She thetripifshe .如果他有空，他会帮助你的。Ifhe ,he ou.如果Tom考试不及格，他就没有机会上高中了。Tom havethe togotothe highschoolifhe theexams.一般将来时专项练习一、单项选择()1.There ameetingtomorrowafternoon.A.willbegoingtoB.willgoingtobeC.isgoingtobeD.willgotobe()2.Charlie herenextmonth.A.isn'working B.doesn'tworkingC.isntgoingtoworking D.won'work()3.He verybusythisweek,he freenextweek.A.willbe;isB.is;isC.willbe;willbeD.is;willbe()4.There adolphinshowinthezootomorrowevening.A.wasB.isgoingtohaveC.willhaveD.isgoingtobe()5. - you freetomorrow?—No.I freethedayaftertomorrow.A.Are;goingto;willB.Are;goingtobe;willC.Are;goingto;willbeD.Are;goingtobe;willbe()6.Mother meanicepresentonmynextbirthday.A.willgivesB.willgiveC.gives D.give()7.-ShallIbuyacupofteaforyou? - .(不，不要。)A.No,youwon'.B.No,youarent. C.No,pleasedo'.D.No,please.()8.-Whereisthemorningpaper? T ifforyouatonce.A.get B.amgetting C.togetD.willget()9. aconcertnextSaturday?A.TherewillbeB.WilltherebeC.TherecanbeD.Thereare()10.Iftheycome,we ameeting.A.haveB.willhave C.had D.wouldhave()11.He herabeautifulhatonhernextbirthday.A.givesB.gaveC.willgivingD.isgoingtogiving()12.He tousassoonashegetsthere.A.writesB.haswritten C.willwriteD.wrote()13.He inthreedays.A.comingbackB.camebackC.willcomebackD.isgoingtocomingback()14.Ifit tomorrow,we'llgoroller-skating.A.isn'rain B.won'rain C.doesn'rain D.doesntfine()15.-WillhisparentsgotoseetheTerraCottaWarriorstomorrow?-No, (不去).A.theywilln'. B.theywon't. C.theyaren't. D.theydon't.()16.Who we swimmingwithtomorrowafternoon?A.will;goB.do;goC.will;goingD.shall;go()17.We theworkthiswaynexttime.A.doB.willdoC.goingtodo D.willdoing()18.Tomorrowhe akiteintheopenairfirst,andthen boatinginthepark.A.willfly;willgoB.willfly;goesC.isgoingtofly;willgoesD.flies;willgo()19.Thedayaftertomorrowthey avolleyballmatch.A.willwatching B.watchesC.iswatchingD.isgoingtowatch（）20.There abirthdaypartythisSunday.A.shallbeB.willbeC.shallgoingtobeD.willgoingtobe（）21.They anEnglisheveningnextSunday.A.arehaving B.aregoingtohaveC.willhaving D.isgoingtohave（）22. you freenextSunday?A.Will;areB.Will;beC.Do;be D.Are;be（）23.He thereattentomorrowmorning.A.willB.isC.willbeD.be（）24. yourbrother amagazinefromthelibrary?A.Are;goingtoborrow B.Is;goingtoborrowC.Will;borrows D.Are;goingtoborrows（）25.-ShallIcomeagaintomorrowafternoon? - （好的）A.Yes,pleaseB.Yes,youwill.C.No,please.D.No,youwon'.（）26.It theyearofthehorsenextyear.A.isgoingtobeB.isgoingtoC.willbeD.willis（）27. openthewindow?A.WillyoupleaseB.PleasewillyouC.YoupleaseD.Doyou（）28.-Let'sgoouttoplayfootball,shallwe? -OK.I .A.willcomingB.begoingtocomeC.comeD.amcoming（）29.It usalongtimetolearnEnglishwell.A.takesB.willtakeC.spends D.willspend（）30.Thetrain at11.A.goingtoarriveB.willbearriveC.isgoingtoD.isarriving二、动词填空。1.1 （leave）inaminut