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1、Since的用法,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s
2、ince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：1He didnt come since he was busy.他因为忙，所以没有来。2Since this method doesnt work,lets try anoter.既然这种方法不行，我们就试用另一种吧。,三Since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 t
3、o 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。,四、时间状语从句,1.Since从句为非延续性动词的过去时或现在完成时，时间的起点应该从从句动作完成时刻算起。例如：Things have changed a lot since I wrote to you last time.自我上次给你写信之后，情况已发生了很大的变化。She has lived with us since she has come here.自从她来到这里，就一直和我们住在一起。,2.Since从句为延续性动词的一般过去时，表示
4、动作或状态的结束。其含义与动词的词义恰好相反，具有否定意味。例如：All has changed since he was at home.自从他离开家以后，这里的一切都变了。I havent written to her since she lived in London.自从离开伦敦以来，我还没有给她写过信。He has never been to see me since I was ill.自从我病愈以来，他一直没有来看我。Two years have passed since I last smoked.我戒烟已经两年了。,3、如果since从句是延续性动词的现在完成时，则表示动作由
5、开始延续至说话的时候，具有肯定意味。例如：He has never been to see me since I have been ill.自从我生病以来，他一直没有来看我。She has talked little since she has stayed at home.自从她呆在家里以后，就很少讲话。Since we have owned a car，we have gone camping every year.自从我们有了汽车后，年年都去野营。,4.在it is+时间+since从句结构中，since从句是非延续性动词的一般过去时，含有肯定意味。例如：It is three yea
6、rs since her husband left her.她丈夫离开她已经3年了。It is over sixty years since the Peoples Republic of China was established.中华人民共和国已经成立60多年了。,5.在it is+时间+since从句结构中，since从句是延续性动词的一般过去时，含有否定的意味。例如：It is three years since she stayed here.她离开这里已经3年了。How long is it since you were a league member?你退团有多久了?,Since
7、从句,时间状语,原因状语,从句谓语动词是结束性动词,从句谓语动词是延续性动词,一般时态,完成时态,一般时态,完成时态,从谓语动词动作结束的时间起All has changed since he was at home.自从他离开家以后，这里的一切都变了。,从谓语动词动作开始的时间起He has never been to see me since I have been ill.自从我生病以来，他一直没有来看我。,从谓语动词动作结束的时间起Things have changed a lot since I wrote to you last time.自我上次给你写信之后，情况已发生了很大的变
8、化。She has lived with us since she has come here.自从她来到这里，就一直和我们住在一起。,Since之后的时间为点时间,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?
9、-_,he _home since he graduated.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.wai
10、ted6.I _ from him since 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.as B.when C.since D.while,1.Im sure Andre
11、w 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 walked D.had walked3.So
12、 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,
