if条件状语从句_语法.ppt

If从句条件状语从句 WhatwillIdoifitissunnythisweekend sleep playcomputergames goshopping Part1 If的用法 1 Iwanttoknowifhewillgotoparkwithus 2 Wewillhaveapicnicifitdoesn train 3 Ifyouboilwater itbecomessteam 4 Ifyoufeeltired youmusthavearest 宾语从句 条件状语从句 巧计 速记 语法1 if作为宾语从句的引导词 引导宾语从句 是否 语法2 if 如果 引导的条件状语从句 宾语从句 if用于宾语从句中 whether if 改为陈述句语序 由从属连词whether if引导的宾语从句 e g 1 Iwanttoknow 他是否跟我们一起去公园 2 Askhim 他是否能来 3 Ididn tknow 是否要下雨 if whether hewillgototheparkwithus whether if hecancome whetheritwasgoingtorainornot 当句末为ornot时 引导词只能用whether而不能用if If与whether的区别 Idon tknow hewillcomeornot Idon tcareof heishandsome Hewondered tostayherethenextweek hewillcomeisnotdecided 与ornot连用只能用whether 介词后只能用whether 与todo不定式连用只能用whether 作主语只能用whether If引导条件状语从句 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 is buy get doesn tcome wait don twait listen buy Revision Revision 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 Whatwillyoudoifyou rehappy IfI mhappy Iwill IfI mhappy Iwill IfI mhappy Iwill IfI mhappy Iwill clapmyhands stampmyfeet winkmyeyes nodmyhead IfI mhungry Iwill IfI mtired Iwill Lookandsay eatsomefood havearest IfI mill Iwillseeadoctor Lookandsay IfI mlate Iwillsaysorry Ifitrainstomorrow I willwatchTVathome Ifit tomorrow I llplaybasketball doesn train Iwon t playbasketball Ifitissunnythisweekend whatwillyoudo Ifitissunnythisweekend I footballwithmyclassmates Ifitissunnythisweekend I willplay Ifitissunnythisweekend whatwon tyoudo Ifitissunnythisweekend I Ifitissunnythisweekend I Won tstayathome won twatchtelevision Ifyouarefreethisweekend whatwillyoudo IfIamfree sleepwatchTVplaycomputergames practice grammar if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 If条件句 条件句用于陈述语气 表示假设的情况可能发生 其中if是 如果 的意思 用法 1 如果主句是一般将来时 从句则用一般现在时 Ifitrains 从句 Iwillstayathome I llgowithyouifyoudon twanttogoalone 从句 2 如果主句含有must may can等情态动词 从句也要用一般现在时 Ifyoudrivetoofast youmayhaveanaccident Youmuststopifthetrafficisred 3 如果主句是祈使句 从句同样要用一般现在时 Don tgoandplayfootballifyoudon tfinishyourhomework PleasecallmeifhecomesnextSunday 4 表示假设 表示将会发生和可能发生的事 或进行提醒警告 If 句子 一般现在时 主句 主语will may can 动词 Ifyoufinishyourhomework youcangooutandplay IfIhaveenoughmoneynextyear Iwillgototravel 下列从句中的will不是将来时助动词 而是情态动词 翻译为 愿意 Ifyouwillexcuseme Ireallymustgotobed 如果你能原谅我的话 我真的要睡觉了 Ifyouwillwaitaminute I llgoandtellmymotherthatyouarehere 如果你愿意等一会的话 我去告诉我妈妈你来了 试比较下列句子 Ifyouseehimtomorrow givehimthisbook 如果你明天去看他 给他这本书 Ifyouwillseehimtomorrow givehimthisbook 如果你明天愿意去看他 给他这本书 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 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 1 Ifhe not doit I do it 2 Ifyou be lateforschool myteacher be angry are willbe 3Ifshe win theprize we be happy wins willbe 4 IfI not eat somuch I get thinner 5 Ifyou tell them they not believe you don teat willget tell won tbelieve 6I stay athome Ifit rain 7 Ifit not rain I go out 8 we play football Ifitis sun 9 Ifshe become astar herparents not send heraway 10 He watch TV ifhe be free willstay rains doesn train willgo willplay sunny becomes won tsend willwatch is doesn tdo willdo ExerciseTime 5 Mikewantstoknowif apicnictomorrow Yes Butifit we llvisitthemuseuminstead A youhave willrainB youwillhave willrainC youwillhave rainsD willyouhave rains 6 Ireallydon tknowifshe itwhenshe A finds arrivesB finds willarriveC willfind willarriveD willfind arrives 4 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 willbe exercises B C A B C D 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 yourey