when-before-since区别及用法课件

when,before,since句型归纳when-before-since区别及用法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)beabouttodosth…when…

Wewereabouttostartwhenitbegantorain.

我们刚要出发，天就开始下雨了。

(3)beonthepointofdoing…when正要…这时…Wewereontheponitofgivingupwhenatruckcameintooursight.我们正要放弃，这时看到了一辆卡车。

when-before-since区别及用法(4)hardly/sceracely…when…

(一…就…)Hehad/hardly/scarcelyfallenasleepwhenthetelephonerang.

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since;consideringthat.

Itwasfoolishofyoutotakeataxiwhenyoucouldeasilywalkthereinfiveminutes.

when-before-since区别及用法(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.when-before-since区别及用法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Itwillbe/was+时间段+before过一段时间才……

Itwillbe4yearsbeforehegraduates.他还有四年时间毕业了。

Itwas5minutesbeforeheleft.过5分钟才离开

2.before句型when-before-since区别及用法Itwon’tbelong……before….（从句用现在时）Itwasn'tlong……before….（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

when-before-since区别及用法

(3)haddone…before

（才……）

Wehadsailedfourdaysandfournightsbeforewesawland.

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。

when-before-since区别及用法

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Ithasbeen3yearssincehecamebackfromabroad.自从他回国已经三年了

3.since句型when-before-since区别及用法

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Itis5yearssincehelivedinbeijing.他不在北京居住有5年了

3.since句型when-before-since区别及用法1.(04北京春)Wewereswimminginthelake______suddenlythestormstarted.A.when B.while C.until D.before2.(02上海)Hewasabouttotellmethesecret______someonepattedhimontheshoulder.A.as B.until C.while D.when3.(05上海)Hetransplantedthelittletreetothegarden______itwasthebesttimeforit.A.where B.whenC.that D.until5.(06辽宁)Hewasabouthalfwaythroughhismeal______afamiliarvoicecametohisears.A.why B.where C.whenD.whileExercises:A.whenD.whenB.whenB.whenC.whenwhen-before-since区别及用法6.(06天津)ThecostoflivinginGlasgowisamongthelowestinBritain,______thequalityoflifeisprobablyoneofthehighest.A.since B.whenC.as D.while7.(04年江苏)______Iacceptthatheisnotperfect,Idoactuallyliketheperson.A.While B.SinceC.BeforeD.UnlessD.A.8.______enteredtheofficewhenherealizedthathehadforgottenhisreport.A.Hehardlyhad B.Hadhehardly C.Hardlyhadhe D.HardlyhehadCwhen-before-since区别及用法9.(03年北京)Hemadeamistake,butthenhecorrectedthesituation______itgotworse.A.until B.when C.before D.as10.(04福建)Scientistssayitmaybefiveorsixyears______itispossibletotestthismedicineonhumanpatients.A.since B.after C.before D.when11.(06四川)－Whydidn’tyoutellhimaboutthemeeting?－Herushedoutoftheroom______Icouldsayaword.A.before B.u