課題：If引導(dǎo)的條件狀語從句科目：初中英語年級：八年級上主講人：王曉飛表示如果有從句的動作發(fā)生，就(不)會有主句的動作發(fā)生。（如果......就......）一、定義：If有兩種意思：1、是否2、如果√

當(dāng)if引導(dǎo)條件狀語從句時，既可以放在句中，也可以放在句首。但當(dāng)if引導(dǎo)的條件狀語從句放在句首時，從句后面要加逗號與主句隔開。eg.Youwillhaveagreattimeifyougototheparty.=Ifyougototheparty,youwillhaveagreattime.二、If引導(dǎo)條件狀語從句的位置。不管if在句首還是句中，緊跟在if后面的句子是從句，反之，另一句是主句。2、Iloveyouifyouloveme._____________________________________________從句主句主句從句

如何判斷主句和從句？eg.1、IfIhavetime,I'llgotoseeyou.eg.

Pleasebecarefulifyoudriveacarinthestreet.3、主祈從現(xiàn)：主句是祈使句，從句是一般現(xiàn)在時eg.Wemustfollowtherulesifwearestudents.eg:Ifyouworkhard,youwillgetgoodgrades.1、主將從現(xiàn)：主句是一般將來時，從句是一般現(xiàn)在時2、主情從現(xiàn)：主句是含有情態(tài)動詞can\must\should\may等的句子），從句是一般現(xiàn)在時三、If引導(dǎo)的條件狀語從句常見類型四、同義句轉(zhuǎn)換

借助“祈使句+and\or+簡單句”在這種句子中，and表示順承，or則表示轉(zhuǎn)折，意為“否則”。Ifyouworkhard,youwillpasstheexam.=Workhard,andyou'llpasstheexam.Ifyoudon'thurryup,you'llmissthebus.=Hurryup,oryouwillmissthebus.用含介詞with或without的介詞短語轉(zhuǎn)換。Ifthereisnowater,fishcan'tlive.=Fishcan'tlivewithoutwater.Ifyouhelpme,I'llfinishmyjob.=Withyourhelp,I'llfinishmyjob.輸入標(biāo)題文字輸入標(biāo)題文字輸入標(biāo)題文字五、應(yīng)用提升1、IfI________(take)ataxi,it________(be)tooexpensive.2、Putupyourhandsifyou________(have)somequestions.3、Ifyou________(leave)theclassroom,youmustturnoffthelight.4、Ifwe_________(see)manyflowers,we__________(take)manyphotos.5、Idon'tknowifit_________(rain)tomorrow.Ifit___________(notrain)tomorrow,we________(go)totheMountain.