1、Unit 1 The Changing World Topic 3 The world has changed for the better.Section A 1.You have been in New York for a long time.for a long timecame to New Yorkpresentpastsb.have/has been in.某人一直在某人一直在e.g.I have been in the new school _.for two yearstwo years agopresentpastfor+一段时间一段时间for two years.,but
2、 the city has improved a lot since I came here a few years ago.since I came here a few years ago came herepresentpastsince+从句从句（从句谓语动词用过去式）（从句谓语动词用过去式）e.g.She has worked in the school _.since 20102010 presentpastsince+时间点时间点since 2010e.g.He has waited for Tom _.since two hours ago8:00presentpastsinc
3、e+一段时间一段时间+ago10:00since two hours agoI have worked in the school for ten years.=I have worked in the school since ten years ago.=I have worked in the school since 2010.=I have worked here since I came to the school.for+时间段时间段since+时间段时间段+agosince+时间点时间点since+从句从句since/for用法归用法归纳：纳：Complete the sent
4、ences with since or for.1.You have been in New York _ a long time.2.The city has improved a lot _ I came here a few years ago.forsince3 Look carefully and think about the differences between since and for in 1a.Then complete the sentences with since or for and listen and check.1.I have lived in Beij
5、ing _ three years._2011.2.He has waited for Tom _ two hours ago._ two hours.3.We have learned chemistry _ one month._ the new term began.forforforsincesincesince n.化学化学n.学期学期一、have been to/have gone to have+done 二、句子中出现以下标志性的词汇：already,yet,neverbefore,just,ever参见课本P15.三、for+一段时间 since+现在完成时用法总结现在完成时
6、用法总结从句时间点一段时间+ago一、have been to/have gone to-I called you but no one answered.-Oh,I _ the park with my mother.-Helen is not here today.Where is she?-Oh,she _ England and she will be back tomorrow.现在完成时用法总结现在完成时用法总结have been to has gone to 单项选择：1.Every year,_ birds come to the lake to spend winter.A.
7、million of B.millions of C.two millions D.two millions of2.I _ Mr.Zhao since I _ here three years ago.A.knew;came B.have known;came C.knew;have come D.have known;have come3.Lucy _ China for 3 years,but she has lived in Shanghai _ last week.A.has been to；since B.has been in;for C.has been to;for D.ha
8、s been in;since4.-_ have you lived here?-Since I came here in 2001.A.How soon B.When C.How long5.My sister _ play computer games after supper,but now she often takes a walk.A.used to watch B.is used to watching C.would like to watch6.-Is your uncle a worker?-Yes,he has worked on the farm _.A.every year B.twenty years ago C.for twenty yearsThank You!
