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If引导的条件状语从句八年级英语Ifyouarehappy,whatwillyoudo?IfIamhappy,IwillsmileIfyoubecomesad,whatwillyoudo?Sheisdoingherhomework.Shegetsgoodgrades.Ifyouarehard-working,youwillgetgoodgrades.Lead-inIfshewalkstoshool,shewillbelate.Sheisgoingtowalktoshool.Shewillbelate.If引导条件状语从句定义：if”如果，假如“，它引导的句子表示某事发生所需要的条件，即，“在······条件下，某事才能发生，”在句子中充当状语，因此叫状语从句。（If引导的条件状语从句表示假如有从句的动作发生，就会有主句动作的发生）位置：从句可放在主句之前或之后，但是放在主句之前须有逗号隔开IfIhaveenoughmoney,Iwilltravelaroundtheworld=IwilltravelaroundtheworldifIhaveenoughmoneyeg:如果我有足够的钱，我就去环游世界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。主句一般将来时，从句用一般现在时。构成条件从句主句时态If＋一般现在时主语＋shall/will+动词原形例句Ifhecomes,hewilltakeustothezoo.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。Ifyoufinishthehomework，youcangohome．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.练一练：1。如果她早点儿起床，就有时间在家里吃早餐Ifshe________alittleearlier,she’llhavetimetoeatbreakfastathome.2。如果你参加聚会，你将会过得很开心。Ifyou____theparty,you_________agreattime.3。如果明天下雨，我们将不去野餐Ifit____tomorrow,we_______forapicnic.4。如果你经常听英文歌，你将会喜欢英语Ifyouoften_______Englishsongs,you______English.LookandsayIfI’mill,__________________.IfIamhungry,Iwilleatsomefood.IfIamtired,Iwillhavearest.Ifitrainstommorw,IwillwatchTVathome.Ifitdoesn'train,Iwillplaybasketball.1IfI_______________(notunderstand）,Iwillaskmyteacherforhelp.2IfI__________(copy)yourhomework,Iwillcheatmyself.3Ifshe_______________(notget)upearly,she’llmisstheearlybus.4Ifyourmother_______(buy)thebookforyou,itwillbegoodforyourstudy.If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）(3)if从句+主句（含有情态动词）Bey!谢谢收看