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启思教育——初二上1If和unless引导的条件状语从句一、If条件状语从句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。Wecanwalkthereifwecan’tfindabus.如果我们找不到公车，也能走路去那里主句条件状语从句Ifitrainstomorrow,wewillnotgotothezoo.如果明天下雨，我们就不去动物园条件状语从句主句Whatwillyougoifyoufindsomeoneindanger?如果你发现某人有危险，你会怎么做？主句条件状语从句If条件句有不同的类型，简述如下：1.If条件句用于表达客观真理或普通现象时，主，从句时态均用一般现在时，如：Eg.Ifyoufreezewater,itturnsintoice.Afishdiesifyoutakeitoutofwater.2.用if条件句表示将来可能发生的事情的if条件句中，主句用一般将来时，而if从句用一般现在时表示将来的时间，即主将从现。Eg.IfIlikethehouse,Iwillbuyit.如果我喜欢这房子，我就会把它买下IwilltellherifIseeher.如果我见到她，我就会告诉她。主句中的will也可以用情态动词can,may或might等代替。如：Eg.Iftheyarefriendly，Imightinvitethemtotheparty.如果他们很友善，我可能会请他们去参加聚会Ifwehurrynow,wecanstopforcoffeelater.如果我们现在抓紧时间，就可以稍后去喝咖啡注意：在条件句中，主句部分只能使用动词will的一般将来时，不能使用begoingto的结构。二.Unless条件状语从句表示在特定条件下，才决定做或不做一件事，中文用的连接词一般是“除非”和“否则”。如：除非刮台风，否则演唱会将如期进行。在英语中，我们可以用unless表达这个意思，相当于ifnot。以这个句子为例：Theconcertwillbeheldasscheduleunlessthereisatyphoon.=theconcertwillbeheldasscheduleifthereisnotatyphoonShewillkeeponsingingunlesssheistoldtostop.她会一直唱下去，除非有人叫她停止=shewillkeeponsingingifsheisnottoldtostop也可以用or(否则)来做同义句转换Unlessyoulistencarefully,youwon’tknowtheanswer.=ifyoudon’tlistencarefully,youwon’tknowtheanswer.=youshouldlistencarefully,oryouwon’tknowtheanswer.一、单选题1.IfI________hisphonenumber,Iwilltellyou.A.findB.foundC.willfindD.havefound2.Wewillgocampingifit_______tomorrow.A.Won’trainB.didn’trainC.doesn’trainD.isn’training3.I’mwaitingformyfriend.Ifhe_______,I______swimmingalone.A.doesn’tcome;willgoB.won’tcome;willgoC.willcome;won’tgoD.don’tcome;willgo4.______yougotothesupermarketat7p.m,youcanbuyalotofcheapfood.A.IfB.UnlessC.WhetherD.When5.Iwon’tgettothepartyontime______Icatchthefirsttraintomorrowmorning.启思教育——初二上2A.IfB.UnlessC.WhetherD.When6.------Shallwegoonapicnicthisweekend?------Goodidea!Unlessit_______.A.rainsB.doesn’trainC.rainD.won’train7.-----CanIchangethejacketforanotherone______itdoesn’tfitmewell?-----Ofcourse.A.unlessB.ifC.thatD.though8.Nobodycanlearnmathswellheworkshardonit.A.ifBunlessCthoughtDhowever9.Iffishawayfromwater,theydie.A.aretaking,won’tB.aretaken,willC.arebeingtaken,willD.take,won’t10.Eachstudentcanaskteachersforhelpifhehowtoworkouttheproblem.A.willknowB.won’tknowC.don’tknowD.doesn’tknow二、用所给词的适当形式填空1.Ifyou________(feel)tired,you_______________(have)tohavearest.2.Where_______he_________(see)thefilmifhe________________(have)time?3.Ifthere__________(be)fewertrees,there_______________(be)morepollution.4.He_____________(dress)morecasuallyifhe________________(notwork)onweekends.5.IfMarcia_____________(live)alone,she___________________(keep)apetparrot.6.Lana________________(buy)anewdressiftheoldone____________(be)outofstyle.7.Thetwins______________(fight)ifthey_______________(argue).8.I____________(have)abakesaleifI_____________(need)moneyforeducation.9.Peter_____________(send)meabeautifulsouvenirifhe________________(tour)Spain.10.IfMrGreen___________(say)Iamhard-working,myparents_________(feel)glad.11.I____________(go)tothebeachifit________________(notrain)thisweek.12.__________they__________(have)amatchiftheP.E.teacher_____________(be)busy?13.He____(write)alettertohisgrandparentsifhe____(get)hisreportcardthisweek.14.Ifshe____________(get)uplate,she_____________(notcatch)theearlybus.15.Peter________(major)inEnglishifhe____(pass)theexamsinPekingUniversity.15.如果他到的晚了会发生什么事情？What_______________ifhe_____________late?16.如果努力学习，你就会取得好成绩。Ifyou___________________,you___________good_____________.17.他如果看电视太久了，他的父母会不高兴。Ifhe_________TVtoomuch,hisparents____________________unhappy.18.如果我们为他组织生日聚会，大家都会来的。Everyone________________ifwe_____________abirthdayparty__________him.19.如果明天不下雨，我会和你一起去公园的。Ifit____________________tomorrow,I______________gotothepark_________you.20.如果她睡过头了，就会旅游迟到的。She;__________________________thetripifshe___________________.21.如果他有空，他会帮助你的。Ifhe_________________,he_________________you.22.如果Tom考试不及格，他就没有机会上高中了。Tom_________havethe________togotothe________highschoolifhe________theexams.23.你如果抄同学的作业就不能学好各门功课。You____________goodatallthesubjectsifyou______theotherstudents’homework.