初中语法之if条件状语从句

If从句 条件状语从句 主句 if条件状语从句if条件状语从句 主句 从句后加逗号 if条件状语从句要用一般现时 句型结构 时态 If条件状语从句 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 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 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 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 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 summary 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