when,before,since句型归纳11、when句型：句型：(1)bedoingsthwhenHewasstillsmilingwhenthedooropenedandhiswifecamein. 他正笑着的时候门突然开了，他妻子走了进来。(2)beabouttodosthwhenWewereabouttostartwhenitbegantorain.我们刚要出发，天就开始下雨了。(3)beonthepointofdoingwhen正要正要这时这时Wewereontheponitofgivingupwhenatruckcameintooursight.我们正要放弃，这时看到了一辆卡车。我们正要放弃，这时看到了一辆卡车。2(4)hardly/sceracelywhen(一一就就)Hehad/hardly/scarcelyfallenasleepwhenthetelephonerang.他刚要入睡电话就响了。(5)hadjustdonewhen(刚做完刚做完某事发生某事发生)Ihadjustgonetobedafteraveryharddaywhenthephonerang.在劳累了一天之后我刚刚就寝，电话铃就响了。(6)还可以表示原因还可以表示原因“既然既然”，相当于，相当于since;consideringthat.Itwasfoolishofyoutotakeataxiwhenyoucouldeasilywalkthereinfiveminutes.3(4)hardly/sceracelywhen(一一就就)Hehadnot/hardly/scarcelyfallenasleepwhenthetelephonerang.他刚要入睡电话就响了。We had scarcely arrived when he asked us to leave.我们才刚刚到他就叫我们走了.4(1)beforesbcan/could某人还没来得及某人还没来得及BeforeIcouldgetinaword，hehadmeasuredme我还没来得及插话，他就给我量好了尺寸我还没来得及插话，他就给我量好了尺寸(2)Itwillbe/was+时间段时间段+before过一段时间才过一段时间才Itwillbe4yearsbeforehegraduates.(3)他还有四年时间毕业了。他还有四年时间毕业了。(4)Itwas5minutesbeforeheleft.过过5分钟才离分钟才离开开(5)2.before句型句型5Itwontbelongbefore.（从句用现在时）（从句用现在时）Itwasntlongbefore.（从句用过去时）（从句用过去时）没过多久没过多久/用不了多久用不了多久就就eg:Itwasntlongbeforeifoundajob.Itwontbelongbeforeourcontrybecomesadevelopedcountry.我们国家很快就会成为一个我们国家很快就会成为一个发达国家。发达国家。beforelong(adv.)不久，不久，longbefore很久以前很久以前6 (3)haddonebefore（才（才）Wehadsailedfourdaysandfournightsbeforewesawland.我们航行了四天四夜才见到陆地。我们航行了四天四夜才见到陆地。(4)hadnotdone-before-不到不到就就Wehadntrunamilebeforehefelttired.我们还没走到一英里路他就觉得累了。我们还没走到一英里路他就觉得累了。7 Itis/hasbeen时间段时间段sincesb.diddid动作为瞬间动词（非延续性），翻译动作为瞬间动词（非延续性），翻译为自从某事发生以来有多长时间为自从某事发生以来有多长时间Itis5yearssinceheleftBeijing.他离开北京他离开北京5年了年了Ithasbeen3yearssincehecamebackfromabroad.自从他回国已经三年了自从他回国已经三年了 3.since句型句型8 Itis/hasbeen时间段时间段sincesb.diddid动作为持续动词（延续性），翻译为动作为持续动词（延续性），翻译为自从不做某事有多长时间自从不做某事有多长时间Ithasbeen5yearssincehewasastudent.他不当学生有他不当学生有5年了年了Itis5yearssincehelivedinbeijing.他不在北京居住有他不在北京居住有5年了年了 3.since句型句型91. (04北京春) We were swimming in the lake _ suddenly the storm started. A. whenB. whileC. untilD. before2. (02上海) He was about to tell me the secret _ someone patted him on the shoulder. A. as B. untilC. whileD. when3. (05上海) He transplanted the little tree to the garden _ it was the best time for it. A. whereB. when C. thatD. until5. (06辽宁) He was about halfway through his meal _ a familiar voice came to his ears. A. why B. where C. when D. whileExercises:A. whenD. whenB. whenB. whenC. when106. (06天津) The cost of living in Glasgow is among the lowest in Britain, _ the quality of life is probably one of the highest. A. since B. when C. as D. while7. (04年江苏) _ I accept that he is not perfect, I do actually like the person. A. While B. Since C. Before D. Unless D. A. 8._ entered the office when he realized that he had forgotten his report. A. He hardly had B. Had he hardly C. Hardly had heD. Hardly he had C119. (03年北京) He made a mistake, but then he corrected the situation _ it got worse. A. untilB. whenC. beforeD. as10. (04福建) Scientists say it may be five or six years _ it is possible to test this medicine on human patients. A. sinceB. afterC. beforeD. when11. (06四川)Why didnt you tell him about the meeting?He rushed out of the room _ I could say a word. A. beforeB. untilC. whenD. after12. (05北京春) It is almost five years _ we saw each other last time. A. beforeB. sinceC. afterD. because CCAB12