Ifweworkharder,if引导条件状语从句If引导条状语从句时，从句中用普通现在时代替普通未来时。1.If(假如……)引导条件状语从句,主句用普通未来时,从句用普通现在时.（主将从现）Iwon’tgobyplaneifitrainstomorrow.Ifyoudon’thurry,you’llmissthetrain.注意:从句放在主句之前或主句之后.如放在主句之前,要用逗号与主句隔开.If后紧跟句子叫从句,另一个句子叫主句,主句和从句次序能够相互调换。Ifyoustudyhard,you’llgetgoodgrades.nowar,theworld,morebeautiful,Ifhecleanstheroom,hecanget$10fromhismother.IfIwatchTVlate,Ican’tgetupearly.Ifyougetuplate,youmusttakeabustoschool.结论:If引导条件状语从句中:从句用普通现在时态;主句有三种情况普通未来时态含情态动词祈使句Exercises5.Ifyou______(work)hard,yourdreamwillcometrue.6.Ifshe______(study)hard,ShewillgotoBeijingUniversity.7.Ifit_____(rainy)tomorrow,Iwillplaythepiano.8.IfI_____(have)muchmoneyinthefuture,Iwilltravelallovertheworld.1.I’msureifhe_____(go)totheparty,he________(have)agreattime.2.Iftherain_______(stop)tonight,wewillgotothecinema.3.I’llbuyacomputerifI______(have)enoughmoney.4.You_________(notget)nervousifyou_____(do)enoughexercise.5.Ifshe____(be)kindtome,I__________(notargue)withher.6.Iwanttoknowifhe________(come)tomorrow,ifhe_______(come),I__________(give)themassagetohim.7.Ifyou_____(pay)moreattentiontothat,he_________(notget)injured.Exercise