八上Unit7語(yǔ)法（條件狀語(yǔ)從句）培優(yōu)講義一、定義?條件狀語(yǔ)從句是由一個(gè)條件引導(dǎo)詞（如if_____________，unless_____________，aslongas____________等）引導(dǎo)的從句，用來(lái)表達(dá)某種條件下發(fā)生的情況。引導(dǎo)詞部分是從句，其余是主句。二、條件狀語(yǔ)從句的位置?條件狀語(yǔ)從句可位于句首，也可位于句末。放在句首時(shí)，從句后通常用逗號(hào)與主句隔開(kāi)。放在句末時(shí)，從句與主句之間一般不用逗號(hào)。?Ifitdoesn'traintomorrow,I'llbringyoutothepark.（如果明天不下雨，我將帶你去公園。）?Hewillgotoplaythegameunlessheisilltomorrow.（除非他明天病了，不然他會(huì)參加這場(chǎng)比賽。）?三、條件狀語(yǔ)從句的時(shí)態(tài)?（一）主將從現(xiàn)?當(dāng)主句的謂語(yǔ)動(dòng)詞是一般將來(lái)時(shí)，條件狀語(yǔ)從句用一般現(xiàn)在時(shí)。I____________________________________________________________if______________________________tomorrow.（如果明天下雨，我就呆在家里。）?Ifyou______________________________myparty,I______________________________veryhappy.（如果你來(lái)參加我的派對(duì)，我會(huì)非常開(kāi)心。）?（二）主情從現(xiàn)?當(dāng)主句的謂語(yǔ)含有can，may，must等情態(tài)動(dòng)詞時(shí)，條件狀語(yǔ)從句用一般現(xiàn)在時(shí)。?YoumaywatchTVifyou_____________________________________________.（如果你完成了作業(yè)你可以看電視。）?Wecangoforapicnicif____________________________________________________________.（如果天氣好，我們可以去野餐。）?（三）主祈從現(xiàn)?當(dāng)主句是祈使句時(shí)，條件狀語(yǔ)從句用一般現(xiàn)在時(shí)。?______________________________unlessyoufinishyourwork.（不要玩，除非你把活做完了。）?Please______________________________ifyougethome.（如果你到家了，請(qǐng)給我打電話。）?四、unless，if....not，aslongas用法?unless引導(dǎo)的條件狀語(yǔ)從句表示“除非……否則……”的關(guān)系。?I_____________________________________________unless_____________________________________________.（除非雨停了，否則我不會(huì)出去。）You_____________________________________________unlessyou_____________________________________________.（除非你完成作業(yè)，否則你不能看電視。）?if...not也表達(dá)否定條件，表示“……如果不，就不能……”的關(guān)系。You_____________________________________________ifyou_____________________________________________.（如果你不完成作業(yè)，你不能看電視。）?aslongas引導(dǎo)的條件狀語(yǔ)從句表示“只要……就……”的關(guān)系。?You_____________________________________________toplayaslongasyou_____________________________________________.（只要你完成作業(yè)，你就可以出去玩。）?I_____________________________________________youaslongas_____________________________________________.（只要你努力工作，我會(huì)支持你。）?五、練習(xí)?（一）單項(xiàng)選擇?1.Iwillcallyouifhe______back.?A.e B.es C.wille D.came?2.Youwillbelateforschool______youdon'tgetupearly.?A.but B.and C.if D.or?3.We______shoppingunlessit______tomorrow.?A.willgo;willrain B.go;willrain C.willgo;rains D.go;rains?4.Youcan'tpasstheexam______youstudyhard.?A.if B.unless C.or D.so?5.Aslongasyou______hard,youwillgetgoodgrades.?A.willstudy B.studied C.study D.studies?（二）用所給詞的適當(dāng)形式填空?1.Ifhe______(e)tomorrow,Iwilltellhimthenews.?2.Youwon'tpassthetestunlessyou______(work)hard.?3.Wecangototheparkifit______(notrain)tomorrow.?4.Aslongasyoukeep______(practice),youwillimproveyourEnglish.?5.Iwillgotothepartyifhe______(invite)me.?（三）翻譯句子?如果你努力學(xué)習(xí)，你將會(huì)取得進(jìn)步。?__________________________________________________________________________________________________________________________________________________________________________________除非你早點(diǎn)起床，否則你會(huì)錯(cuò)過(guò)早班車(chē)。?__________________________________________________________________________________________________________________________________________________________________________________只要你遵守規(guī)則，你就可以在這里玩。?__________________________________________________________________________________________________________________________________________________________________________________如果明天天氣好，我們就去釣魚(yú)。?__________________________________________________________________________________________________________________________________________________________________________________如果他有空，他會(huì)和我們一起去看電影。?__________________________________________________________________________________________________________________________________________________________________________________答案?（一）單項(xiàng)選擇?1.B 2.C2.C 3.C 4.B 5.C（二）用所給詞的適當(dāng)形式填空?es2.work3.doesn'train4.practicing5.invites（三）翻譯句子?1.Ifyoustudyhard,youwillmakeprogress.?2.Youwillm