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1、 一Since作为介词,后接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。例如: 1、He left the village in 1982 and I havent seen him since then.1982年他离开这个村子,从那以后我再没见过他。 2、Shes been working in a bank since leaving school.她中学毕业后就一直在一家银行工作。 3.He had spoken to her only once since the party. 自从那次聚会以来,他只跟她说过一次话。 二Since
2、作为副词,表示从过去以来、以后或到现在的情形或状态,常与现在完成时态连用。例如: 1He left home two weeks ago and we havent heard from him since. 他两周前离开了家,到现在我们一直没有他的消息。 2He came to Zhenjiang 6 years ago and has lived here (ever) since.他6年前来到镇江,从此便住在这里。 三since引导原因状语从句 作为连词,since可引导原因状语从句,表示因为;既然;鉴于:例如: 1 He didnt come since he was busy.他因为
3、忙,所以没有来。 2 Since this method doesnt work,lets try anoter.既然这种方法不行,我们就试用另一种吧。 四Since在特殊句型中的应用 句型I:“It is (has been)+时间+since+持续性动词的过去时”,表示“自从以来到现在已有多久。”例如: It has been quite some time since I was last in London.我上次离开伦敦至今颇有一段时间了。 句型II:“It was+时间+since+持续性动词的过去完成时”,表示“从到过去某时间点以来”,例如:It was three years
4、since we had been here.那时我们在这已呆了三年。 六巩固练习 (一)单项选择1Do you smoke?_ Its two years since I smokedAYes,I do BNo,I dont CNot too much DOh,but I wish I didnt2Since you are busy, you _ tomorrow. A. dont need come B.need not come C. neednt come D.mustnt come 3.-Has he been home? -_,he _home since he graduate
5、d. A. No; hasnt been B.Yes;has been C.No; isnt D.Yes; is 4They _friends since they met in Shanghai. A.havent been B.have been C. arent D. are 5.I_here since he left the door open,but it seems that he wont come back today. A. have been waiting B.will have waited C.was waiting D.waited6.I _ from him s
6、ince he has lived here. A. heard B. have heard C. have never heard D.have been hearing 7. He came to China _ 1998.A. from B. since C. at D. in8.- Excuse me.Did you notice whether the No.18 bus had gone by?-I dont know_ I began to stand here just now.A. as B.when C.since D.while现在完成进行时和现在完成时练习1. Im s
7、ure Andrew will win the first prize in the final. I think so. He _ for it for months. (2008江苏)A. is preparing B. was preparing C. had been preparing D. has been preparing2. By the time he realizes he _ into a trap, itll be too late for him to do anything about it. (2008山东) A. walks B. walked C. has
8、walked D. had walked3. So far this year we _ a fall in house prices by between 5 and 10 percent. (2008福建) A. saw B. see C. had seen D. have seen4. Cathy is taking notes of the grammatical rules in class at Sunshine School, where she _ English for a year. (2007湖南) A. studies B. studied C. is studying D. has been studying 5. Danny _ hard for long to realize his dream and now he is popular. (2007福建)A. works B. is working C. has worked D. had worked DCDDC