深圳牛津8BChapter1◆◆引导条件状语从句最常用的连词是if。if引导的条件句有真实条件句和非真实条件句两种（非真实条件句会在以后的虚拟语气中阐述），其引导的真实条件状语从句表示在某种条件下某事很可能发生。1）.如果if条件句讲述自然规律或肯定会发生的事情，则主从句大多用一般现在时态。e.g.:Ifyoutakeafishoutofwater,itdies.如果把鱼从水中拿出，它会死。2）.在if引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。e.g.:Ifyouaskhim，hewillhelpyou．如果你请他帮忙，他会帮你的。Ifyoufailintheexam，youwilllethimdown．如果你考试不及格，你会让他失望的。Ifyouhavefinishedthehomework，youcangohome．如果你作业做完了就可以回家了。◆◆unless引导的条件状语从句：unless=ifnot.conj.除非,若不,除非在……的时候e.g.:Let'sgooutforawalkunlessyouaretootired.=Ifyouarenottootied,let'sgooutforawalk.我们出去散步吧，除非是你太累。Youwillfailtoarrivethereintimeunlessyoustartearlier.如果你不早点动身,你就不能及时赶到那儿。Unlessitrains,thegamewillbeplayed.除非下雨,比赛将照常进行。◆“if”引导的条件状语从句的用法,现在总结一下:if条件句不一般,几个要点记心间;条件句,放在前,逗号要放句中间。条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。◆注意：在if引导的条件状语从句中，if和条件句位置灵活，可直接放在主句后面，若if条件句放句首，从句后面要加逗号，和主句隔开。[拓展]：so/aslongas表示：“只要”。如：AslongasIknowthemoneyissafe,Iwon’tworryaboutit.Aslongasitdoesn’train,wecanplayfootball.一．选择（）1，Althoughheisverytall,__herunsveryslow.A.\B.butc.soD.and（）2，-WhereisMrWang?-He__thebankforsomemoney.A.hasbeentoB.hasgonetoC.soD.and（）3，Ihaveapetdog___Huanhuan.A.callB.callsC.nameD.named（）4，ShehasneverbeentotheUSA.____I.A.NeitherdidB.NeitherhasC.SohaveD.Neitherhave（）5，Mysisterwasborn____themorning____October1st.A.on;inB.on;ofC.in,ofD.in,on（）6，Whatdidyourmothersay?She__she___anewspaperatthattime.A.said;isreadingB.said;wasreadingC.says;wasreadingD.says;isreading（）7，-Howlonghaveyoubeenworkinginthespacemuseum?-____.A.sincetenyearsagoB.NextyearC.TenyearsagoD.for2000（）8，NobodycanlearnEnglishwell__heworkshardonit.A.ifB.whenC.unlessD.but（）9，-MyWanghasdecidedto__smoking.-That'sgoodnews.Ihopehecandoitsuccessfullythistime.A.turnoffB.tryoutC.cleanupD.giveup（）10，MrsGreenusedto__awalkaftersupperwhenshewasinthecountryside.Nowshegetsusedto__awalkinthegarden.A.take;takeB.take;takingC.taking;takeD.takeing;takeing（）11，They'regoingtosetupafoodbanktohelp__people.A.tiredB.sickC.angryD.happy（）12，BythetimeIgothome,Ginaandhersister__already____theirhomework.A.has;finishB.have;finishC.had;finishedD.will;finish,（）13，IlovethesongJingleBellsbecauseitoften__me__ChristeasDay.A.think;ofB.provides;withC.reminds;ofD.starts;with（）14，Don'teattoomuchjunkfoodanddomoreexercise.Youaresuretokeepfit__.A.byaccidentB.bymistakeC.infactD.inthisway（）15，What__toheryesterdayevening?,A.washappenedB.happenedC.happeningD.happen（）16，I'moldenoughtowash__clothesbymyself.Youcanjustwash___?A.my;yourB.mine;yoursC.my;yoursD.your;my（）17，-Mom,Iwanttoaskgrandpeaquestion.-Oh.__isreadinganewspaperupstairs.A.HeB.HimC.HisD.Himself（）18，Stopcuttingtrees,__theearthwillbecomeworseandworse.A.andB.soC.orD.\（）19，Theman__isleavingforAmericanextweek.A.thewomanistalkingtohimB.whomthewomanistalkingC.thewomanistalkingtoD.tothewomanistalking（）20，It'stimeforclass.Youmusts...
