if条件状语从句的语法--初中

If从句（条件状语从句）Completethesentenceswiththecorrectformofthewords.1.Ifyou_______(listen)tothemusic,_____(buy)aCD.2.Ifhe______(be)lateforschool,______(notwait)forhim.3.Ifyou____(buy)anewcamera,____(get)agoodone.4.Ifthelight____________(notcome)on,____(wait)foroneminute.isbuygetdoesn’tcomewaitdon’twaitlistenbuy祈使句+if条件状语从句if条件状语从句，+祈使句（从句后加逗号）if条件状语从句要用一般现在时。句型结构时态If条件状语从句（1）Let’ssingthesonginChinese:IfyouarehappyWhatwillyoudoifyou’rehappy?IfI’mhappy,Iwill____________.IfI’mhappy,Iwill____________.IfI’mhappy,Iwill____________.IfI’mhappy,Iwill______________.clapmyhandsstampmyfeetwinkmyeyesnodmyheadIfI’mhungry,Iwill______________.IfI’mtired,Iwill_____________.LookandsayeatsomefoodhavearestIfI’mill,__________________.IwillseeadoctorLookandsayIfI’mlate,_________________.IwillsaysorryIfitrainstomorrow,I_____________________.willwatchTVathomeIfit_____________tomorrow,________________.I’llplaybasketballdoesn’trainIwon’t________________.playbasketballIfyouarefreethisweekend,whatwillyoudo?IfIamfree,…sleepwatchTVplaycomputergamespracticeif条件状语从句(2)句子特点：1.if从句中用一般现在时，表示未来的一种条件，从句中可以加时间状语。2.当if表示未来的条件时，主句中用一般将来时。句型结构：主句+if条件状语从句if条件状语从句，+主句（从句后加逗号）3.时态：if一般现在时，+主句一般将来时或（can/may/must+v.)e.g.1.Ifyoudon’tgetupearly,youwillbelateforschool.你如果不早点起床，上学就会迟到。2.IfIplaygamesonit,itwillgowrong.如果我用它玩游戏，它就会坏掉。3.Ifyoufinishthehomework，youcangohome．如果你作业做完了就可以回家了。4.Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想减肥，你必须少吃面包。5.Ifyouheaticeitturnstowater.(也可用willturn)如果把冰加热，它就会化成水。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。if条件句有特点,现在时把将来替；这个规则要牢记!if条件句歌诀1.Ifhe____________(not,doit),I___________(do)it.2.Ifyou____(be)lateforschool,myteacher________(be)angry.arewillbe3Ifshe________(win)theprize,we_______(be)happy.winswillbe4.IfI_________(not,eat)somuch,I_________(get)thinner.5.Ifyou______(tell)them,they_____________(not,believe)you.don’teatwillgettellwon’tbelieve6I_________(stay)athome,Ifit__________(rain).7.Ifit____________(not,rain),I_________(go)out.8.we__________(play)football,Ifitis_________(sun).9.Ifshe__________(become)astar,herparents____________(not,send)heraway10.He_________(watch)TV,ifhe______(be)free.willstayrainsdoesn’trainwillgowillplaysunnybecomeswon’tsendwillwatchisdoesn’tdowilldo---I’malwaystiredinthemorning.---Ifyougotobedearly,youwon’tbetiredinthemorning.Givingsuggestions:---IgetthirstywhenIrun.---Ifyoutakesomewaterwithyou,youwon’tgetthirstywhenyourun.Iworrysomuchaboutmyschoolwork.---Ifyoualwaysworkhard,youwon’tworryaboutyourschoolwork.Youshouldworkhard!Unit3activity1Rewritethesentenceswithif:Listeninclass,oryouwon’tunderstandwhattodo.Ifyoudon’tlisteninclass,youwon’tunderstandwhattodo.1)Eatsomebreakfast,oryou’llgethungryatschool.2)Hurryup!We’llbelate!3)Readtheinstructionscarefully.Thenyou’llknowwhattodo.Ifyoudon’teatsomebreakfast,you’llgethungryatschool.Ifyoudon’thurryup,we’llbelate.Ifyoureadtheinstructionscarefully,you’llknowwhattodo.Activity2.Completethesentences—Iwanttogethighscores.—If__________________________(workhard/dowell)youworkhard,youwilldowell.1.-howcanIremembermyfriends’birthdays?-If_______________________________________(keepanoteinyourdiary/notforget).2.-It’slate,butIdon’twanttogotosleep.-If_______________________________________(notgetenoughsleep/feeltiredatschool).youkeepanoteinyourdiary,youwon’tforget.youdon’tgetenoughsleep,you’llfeeltiredatschool.3.-Idon’tlikespeakingEnglishoutsidetheclassroom.-If_______________________________________(notpractice/notimprove).4.-ShouldItellmyteacherIdon’tunderstandthehomework?-If_______________________________________(nottellher/shenotabletohelpyou).5.-IsitOKifIwatchTVforsixhours?-If_______________________________________(youwatchtoomuch/eyeshurt).youdon’tpractice,youwon’timprove.youdon’ttellher,shewon’tbeabletohelpyou.youwatchtoomuchTV,youreyeswillhurt.if的用法2.引导条件状语从句：译为“如果，假如”(1)if从句+祈使句(2)if从句+主句（一般将来时）1.引导宾语从句：译为“是否”，表示不确定的概念。Idon’tknowifyourfathercancometogether.Canyoutellmeifmissyourparents?e.g.IfIwereyou,Iwouldinvitehimtotheparty.如果我是你，我会邀请他参加聚会。Ifhehadhurried,hecouldhavecaughtthetrain.如果他抓紧点，他会赶上火车的。IfIweretogoabroad,IwouldgotoAmerica.如果我出国了，我会去美国。3.非真实条件句（虚拟语气）：表示不可实现的条件或根本不存在的条件。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。()6.─Mikewantstoknowif____apicnictomorrow.─Yes.Butifit_______,we'llvisitthemuseuminstead.A.youhave/willrainB.youwillhave/willrainC.youwillhave/rainsD.willyouhave/rains()7.Ireallydon'tknowifshe_______itwhenshe________.A.finds/arrivesB.finds/willarriveC.willfind/willarriveD.willfind/arrives（）4.Idon’tknowif______tomorrow.A.itdoesn’trainB.therainwillstopsC.therainswon’tstopD.itwon’train（）5.Thevolleyballmatchwillbeputoff(推迟）ifit______.A.willrainB.rainsC.rainedD.israining（）1.Becareful,ifyou______wanttomakemistakes.A.won’tB.don’tC.didn’tD.not（）2.Workhardifyou______togetagoodmark.A.wantedB.wantingC.wantD.willwant（）3.--Iwanttoknowifyou______tothepartytomorrow.--IwillifI_____free.A.willcome;amB.come;amC.willcome;willbeD.come;willbeexercisesBCADBCDIfyouhavesomeproblemsinyourlife,whatwillyoudo?ProblemsMrGreen’sproblem?IfIhaveenoughmoney,Iw