【文档说明】when-before-since区别及用法课件.ppt，共(12)页，364.000 KB，由小橙橙上传

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--精品--when,before,since句型归纳1、when句型：(1)bedoingsth…when…Hewasstillsmilingwhenthedooropenedandhiswifecamein.他正笑着的时候门突然开了，他妻子走了进来。(2)beabo

uttodosth…when…Wewereabouttostartwhenitbegantorain.我们刚要出发，天就开始下雨了。(3)beonthepointofdoing…when正要…这时…Wewereontheponit

ofgivingupwhenatruckcameintooursight.我们正要放弃，这时看到了一辆卡车。--精品--(4)hardly/sceracely…when…(一…就…)Hehad/hardly/scarcelyfallenasleepwhent

hetelephonerang.他刚要入睡电话就响了。(5)hadjustdone…when…(刚做完…某事发生)Ihadjustgonetobedafteraveryharddaywhenthephonerang.在劳累了一天之后我刚刚就寝，电话铃就响了。(6)还可以表示原因“既然”，相当于s

ince;consideringthat.Itwasfoolishofyoutotakeataxiwhenyoucouldeasilywalkthereinfiveminutes.--精品--(4)hardly/sceracely…when…(一…就…)Hehadnot/hardly/

scarcelyfallenasleepwhenthetelephonerang.他刚要入睡电话就响了。Wehadscarcelyarrivedwhenheaskedustoleave.我们才刚刚到他就叫我们走了.-

-精品--(1)beforesbcan/could…某人还没来得及……BeforeIcouldgetinaword，hehadmeasuredme．我还没来得及插话，他就给我量好了尺寸(2)Itwillbe/was+时间段+before过一段时间才……Itwillbe4yearsbeforeh

egraduates.(3)他还有四年时间毕业了。(4)Itwas5minutesbeforeheleft.过5分钟才离开(5)2.before句型--精品--Itwon’tbelong……before….（从句用现在时）Itwasn'tlong……befo

re….（从句用过去时）没过多久/用不了多久……就……eg:Itwasn'tlongbeforeifoundajob.Itwon'tbelongbeforeourcontrybecomesadevelopedcountry.我

们国家很快就会成为一个发达国家。beforelong(adv.)不久，longbefore很久以前--精品--(3)haddone…before（才……）Wehadsailedfourdaysandfournight

sbeforewesawland.我们航行了四天四夜才见到陆地。(4)hadnotdone---before---不到……就……Wehadn’trunamilebeforehefelttired.我们还没走到一英里路他就觉得累了。--精品--Itis/hasbeen＋时

间段＋sincesb.did…§①§did动作为瞬间动词（非延续性），翻译为自从某事发生以来有多长时间Itis5yearssinceheleftBeijing.他离开北京5年了Ithasbeen3yearssincehecamebackfromab

road.自从他回国已经三年了3.since句型--精品--Itis/hasbeen＋时间段＋sincesb.did…§②§did动作为持续动词（延续性），翻译为自从不做某事有多长时间Ithasbeen5yearssincehewasastudent.他不当学生有5年了I

tis5yearssincehelivedinbeijing.他不在北京居住有5年了3.since句型--精品--1.(04北京春)Wewereswimminginthelake______suddenlythestormstarted.A.whenB.whileC.unt

ilD.before2.(02上海)Hewasabouttotellmethesecret______someonepattedhimontheshoulder.A.asB.untilC.whileD.when3.(05上海)

Hetransplantedthelittletreetothegarden______itwasthebesttimeforit.A.whereB.whenC.thatD.until5.(06辽宁)Hewasabouthalfw

aythroughhismeal______afamiliarvoicecametohisears.A.whyB.whereC.whenD.whileExercises:A.whenD.whenB.whenB.whenC.when--精品--6.(06天津)Thecostoflivingi

nGlasgowisamongthelowestinBritain,______thequalityoflifeisprobablyoneofthehighest.A.sinceB.whenC.asD.while7.(04年江苏)______Ia

cceptthatheisnotperfect,Idoactuallyliketheperson.A.WhileB.SinceC.BeforeD.UnlessD.A.8.______enteredtheofficewhenherealizedthathehadf

orgottenhisreport.A.HehardlyhadB.HadhehardlyC.HardlyhadheD.HardlyhehadC--精品--9.(03年北京)Hemadeamistake,butthenhecorrectedthesituation______itgotworse.

A.untilB.whenC.beforeD.as10.(04福建)Scientistssayitmaybefiveorsixyears______itispossibletotestthismedicineonhumanpatients.A.sinceB.afterC.beforeD.w

hen11.(06四川)－Whydidn’tyoutellhimaboutthemeeting?－Herushedoutoftheroom______Icouldsayaword.A.beforeB.untilC.whenD.after12.(05北京春)Itisalmostfi

veyears______wesaweachotherlasttime.A.beforeB.sinceC.afterD.becauseCCAB