初中英語語法-If引導(dǎo)的條件狀語從句(講解及練習(xí))

精選精選初中英語一一條件狀語從句（講解&練習(xí)）I條件狀語從句的定義II條件狀語從句的引導(dǎo)詞1.if引導(dǎo)的條件狀語從句表示在某種條件下某事很可能發(fā)生。Ifwepaymuchattentiontotheearth,we'llhaveabetterworld.如果我們多關(guān)愛地球，就會擁有一個更美好的世界Ifitrainstomorrow,whatshallwedo?如果明天下雨，我們怎么辦？注意：if還可以引導(dǎo)虛擬條件句，表示不可實現(xiàn)的條件，從句中多用一般過去時或過去完成時。Whatwouldhappeniftherewerenowater?如果沒有水會怎樣？unless引導(dǎo)的條件狀語從句unless的意思是如果不，除非?？膳cif...not互換。YouwillfailinEnglishunlessyouworkhard.你英語考試會不及格的，除非你更加努力。as/solongas引導(dǎo)的條件狀語從句as/solongas意思是“只要”Solongasyou'rehappy,iwillbehappy.只要你高興，我就高興。III條件狀語從句的種類W條件狀語從句的時態(tài)原則條件句從句主句真實一般現(xiàn)在時一般將來時情態(tài)動詞+動原祈使句非真實一般過去時be動詞用（were）would/could+動原學(xué)習(xí)"if"引導(dǎo)的條件狀語從句的用法,現(xiàn)在總結(jié)一下:if條件句不一般,幾個要點記心間;條件句,放在前,逗號要放句中間。條件句表真實，主將從現(xiàn)要遵從；條件句非真實，虛擬語氣用到位。

練習(xí)I?單項選擇)1.Ifyoutotheparty,you'llhaveagreattime.D.goingD.doesn'trainD.willgoD.cameA.willgoD.goingD.doesn'trainD.willgoD.came()2.Ihertheanswerifsheme.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks()3.一Whatareyougoingtodotomorrow?--We'llgotothelibrarytomorrowifit___.A.isn'trainB.rainC.won'train)4.Whatwillyoudoifyoutotheoldfolk'shome?A.goB.wentC.going)5．I'llgivethebooktohimifhe___herenextSunday.A.willcomeB.comesC.iscomingII?用所給詞的適當(dāng)形式填空1fyou(feel)tired,you(have)tohavearest.Wherehe(see)thefilmifhe(have)time?Ifthere(be)fewertrees,there(be)morepollution.IfMarcia(live)alone,she(keep)apetparrot.Lana(buy)anewdressiftheoldone(be)outofstyle.Thetwins(fight)ifthey(argue).I(have)abakesaleifI(need)moneyforeducation.Peter(send)meabeautifulsouvenirifhe(tour)Spain.I(go)tothebeachifit(notrain)thisweek.they(have)amatchiftheP.E.teacher(be)busy?Ifshe(get)uplate,she(notcatch)theearlybus.III.翻譯下列句子如果他到的晚了會發(fā)生什么事情？Whatifhelate?如果努力學(xué)習(xí)，你就會取得好成績。Ifyou,yougoodmarks.他如果看電視太久了，他的父母會不高興。IfheTVtoomuch,hisparentsunhappy.如果我們?yōu)樗M織生日聚會，大家都會來的。Everyoneifweabirthdaypartyhim.如果明天不下雨，我會和你一起去公園的。Ifittomorrow,Igototheparkyou.如果她睡過頭了，就會旅游遲到的。She;thetripi