《Unit3Languageinuse (4).ppt》由会员分享，可在线阅读，更多相关《Unit3Languageinuse (4).ppt（22页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、4Unit 3 Language in use.To summarise and consolidate the use of the present perfect tense together with since and forTo be able to understand learning materials on healthTo be able to carry out a survey on healthy living with the help of othersTeaching aims I havent done much exercise since I got my
2、 computer last year.I have had him for three months now.Since then,it has become part of my life.现在完成时（三）现在完成时（三）当表示动作已经充成并对现在有一定影响当表示动作已经充成并对现在有一定影响时，我们一般用现在充成时。同时，可分时，我们一般用现在充成时。同时，可分别别 用用just,already或或yet加以强调或说明。加以强调或说明。其结构也是：其结构也是：have/has+动词的过去分词动词的过去分词.常用的时间状语有常用的时间状语有:already,just,一般置于一般置于hav
3、e/has 之后，之后，用用于肯定句中于肯定句中；在否定句中在否定句中则要用则要用yet 表示表示“还，未还，未”。Grammarfor 和和 since 在现在完成时中的应用在现在完成时中的应用for与与since都能与现在完成时连用，但区别较都能与现在完成时连用，但区别较大：大：（1）for后须接后须接“时间段时间段”He has studied English for five years.他学英语他学英语5年了。年了。（2）since后须接后须接“时间点时间点”He has studied English since 1999.他从他从19991999年开始学英语。年开始学英语。（3）
4、二者可以转换）二者可以转换 for+一段时间一段时间=since+一段时间一段时间+ago He has been here for five weeks.=He has been here since five weeks ago.他到这儿已经有五个星期了。他到这儿已经有五个星期了。如：如：He has taught here since he came to China.自从他来到中国就在这儿教书。自从他来到中国就在这儿教书。We have been friends since we met in school.我们从在学校见面起就成为了好朋友。我们从在学校见面起就成为了好朋友。(4)si
5、nce能引导时间状语从句能引导时间状语从句(主句用现在完主句用现在完成时，从句用一般过去时成时，从句用一般过去时)，而，而for则不能。则不能。（5）现在完成时常用句型：现在完成时常用句型：It is(has been)+时间段时间段+since+时间状语或时间状语或从句从句It is four days since last Friday.从上周五到现在已经四天了。从上周五到现在已经四天了。It has been two years since Jim came to Beijing.吉姆来北京已经两年了。吉姆来北京已经两年了。This is the first(second)time th
6、at+从句从句 句型中的句型中的that从句通常使用现在完成时。从句通常使用现在完成时。如如：This is the first time that Jenny and Danny have been to China.这是珍妮和丹妮第一次来屮国。这是珍妮和丹妮第一次来屮国。This is the third time that I have seen Karen.这是我第三次见到这是我第三次见到Karen。（6）均须与延续性动词连用，也可以与非延）均须与延续性动词连用，也可以与非延 续性动词的否定式连用。续性动词的否定式连用。如如:I have bought this computer si
7、nce four years ago.()I have had this computer since four years ago.()I havent bought anything for two months.()I havent heard from him for 3 weeks.()非延续性动词和延续性动词的转换非延续性动词和延续性动词的转换leave be away borrow keepbuy have begin/start be ondie be dead finish-be overopen sth keep sth open fall ill be ill get u
8、pbe up,come here be here,join be on+组织机构组织机构 /be a member of+组织机构组织机构,go there be there,become be,come backbe back,fall asleep be asleep,get to/arrive/reach be(in),leave be away from,get to know know,go(get)out tie out，put onwear,catch a cold have a cold,get marriedbe married 等。等。The old man died 4
9、years ago.The old man has been dead for 4 years.It is 4 years since the old man died.Four years has passed since the old man died.He joined the Party 2 years ago.He has been in the Party for 2 years.I bought the book 5 days ago.I have had the book for 5 days.例如：例如：（7）二者引出的时间状语往往用）二者引出的时间状语往往用 how lo
10、ng提问。提问。How long have you had this book?这本书你买多久了这本书你买多久了?For a week./Since a week ago.买一周了。买一周了。1.We have worked in this company since we _to this city.A.move B.have moved C.moved D.are moving2._have you stayed in the garden?A.How often B.How long C.How far D.How manyExerciseCB一、一、单项单项选择题。选择题。3.He h
11、as taught at this school _2005.A.since B.in C.forD.on4.The dog _for seven days.A.died B.has died C.has been dead D.dies5.Lucy _ after her grandma since two years ago.A.looks B.looked C.will look D.has lookedACD1.I have been here _five months ago.2.He has been a soldier _ about two months.3.Great cha
12、nges have taken place _ you left.4.His grandpa has been dead _ ten years.5.I have studied English _ I was 12 years old.6.It is two years _ I became a postgraduate student.sinceforsinceforsincesince二、二、选择选择for或或since填空：填空：1.Jim is in Japan.He arrived there three days ago._2.They are very hungry.Their
13、 last meal was ten hours ago._ 三、三、Rewrite the sentences using for or since.Jim has been in Japan for three days.They are very hungry because they havent had their meal for ten hours.3.I have a camera.I bought it in 2009._4.I know Anna.I first met her three years ago._5.Linda is ill.She became ill on Monday._I have had a camera since 2009.I have known Anna for three years.Linda has been ill since Monday.HomeworkTry your best to master what you have learned in this module and preview the next module.