《Lesson 16 Unit Review》课文讲解和练习

lesson 16 unit review语法专项讲解语法专讲现在完成时：1.现在完成时的基本概念和用法：现在完成时由have（has）＋动词的过去分词构成。

规则动词的过去分词的构成与动词过去式相同，不规则动词的过去分词各不相同，需个别记忆。

（1）现在完成时表示过去所发生的动作对现在的影响或产生的结果，常与just（刚刚），already（已经），ever（曾经），never（从来），yet（尚，还）等表示时间的副词搭配使用。

Have you ever seen the film?你看过这部电影吗？She has already bought a lot of things.她已经买了许多东西。

（2）表示一个从过去某个时间开始，延续到现在并可能持续下去的动作，常与表示段时间的时间状语连用，这样的时间常用since或for来构成。

since后面加时间点或从句（从句的时态常用一般过去时）for后加时间段：He has worked here for 15 years.他在这里工作了15年了。

I have studied English since I came here.自从我来这里，一直在学英语。

肯定式，否定式，疑问式如下：I （We, You, They）have read it.He （She）has read it.I （We, You, They）have not read it.He （She）has not read it.Have I （we, you, they）read it?Has he （she）read it?（3）某些非延续性动词即动作开始便终止的动词，在现在完成时中不能与表示一段时间的状语搭配。

例如下面这些动词属于非延续性动词，并非不能用于现在完成时，而是不能接由for或since引导的时间状语。

die, arrive, join, leave, go, finish, buy, come lend, borrow, marry, 例如：He has come here for two hours. （×）他来了两个小时了。

He has been here for two hours.（4）have （has）gone to表示去了某地但还没有回来。

have（has）been to表示去过某地并且已经回来。

He has gone to Shanghai.他到上海去了。

He has been to Shanghai.他去过上海。

2. 现在完成时与一般过去时的区别：现在完成时表示过去发生的某一动作对现在造成的影响或结果，强调的是现在的情况，所以它不能和表示过去的时间状语连用。

而一般过去时只单纯表示过去的动作或状态，和目前情况无关，它可以和表示过去的时间状语，如yesterday, last year, just now等连用。

试比较：It snowed heavily yesterday.昨天雪下得很大。

It has snowed for three days.已经下了三天雪了。

现在完成时专项练习针对练习基础过关课堂巩固，基础闯关一、单项选择。

( )1、Both his parents look sad . Maybe they _________what's happened to him.A. knewB. have knownC. must knowD. will know( )2、He has _______ been to Shanghai, has he ?A. alreadyB. neverC.everD. still( )3、Have you met Mr. Li ______？A. justB. agoC. beforeD. a moment ago( )4、The famous writer _____ one new book in the past two year.A. is writingB. was writingC. wroteD. has written( )5、—Our country ______ a lot so far.—Yes. I hope it will be even ______.A. has changed ; wellB. changed ; goodC. has changed ; betterD. changed ; better( )6、Zhao Lan ______already ______in this school for two years.A. was ; studyingB. will ; studyC. has ; studiedD. are ; studying( )7.We______Xiao Li since she was a little girl.A. knowB. had knownC. have knownD. knew( )8、Harry Potter is a very nice film .I_______ it twice.A. will seeB. have seenC. sawD. see( )9.—These farmers have been to theUnited States.—Really ? When _____ there ?A. will they goB. did they goC. do they goD. have they gone( )10.—______ you ___ your homework yet?—Yes . I _____ it a moment ago.A. Did; do; finishedB. Have; done; finishedC. Have; done; have finishedD. will; do; finish拓展提高课后拓展，提升能力Ⅰ.（中考高频题）单项选择( )1.(2005年重庆) Nowadays science fiction isn’t as ____________ as cartoons among teenagers.A. popularB. more popularC. less popularD. the most popular( ) 2.（2006年福州） We are glad to see that Shanghai is developing ________ these years than ever before.A. quicklyB. less quicklyC. more quicklyD. the most quicklyII.（创新题）句型转换填空。

1、He has never surfed, _____ ________?（改成反意疑问句）2、They have been here since 2000. (对划线部分提问)______ __________have they been here?3、The old man _________ last year. He _____ _______for a year. (die) （动词填空）4、This factory opened twenty years ago.(同义句转换)This factory ______ ______ ______ for twenty years.5、Miss Gao left an hour ago. (同义句转换)Miss Gao ________ _______ ________ ________ an hour ago.6、Her mother has been a Party member for three years .（同义句）Her mother____the Party three years __.7、The Green Family moved to France two years ago. (同义句转换)_______ two years ________ the Green family moved to France.8、The bus has arrived here. It arrived ten minutes ago. (把两个句子合并成一个句子)__________________________________________III.（兴趣题）选词填空。

请从方框内选择适当的词语完成这封信。

Writing, talking,sitting ,playing, swimming , flying,sunny, studying,drawing, havingDear Bob,My name is Rich .I’m fourteen years old .I’m(1)__________ in a middle school .My school is nice and clean. There are 30 students in my class .It’s(2) _______ today . My classmates and I are(3) ________ a good t ime on the beach .It’s a nice plac e .The water is blue and clear . Many birds are(4) ________ over the sea .Many people are (5)_________ . Some boys are(6) _________ football . Some people are (7)________ on the beach . A girl is(8) _________ pictures on a chair .Another girl is (9)________ photos .I’m (10)_________to you ! What are you doing ? I hope you can write to me soon .Best wishes!Rich1____ 2______ 3_______ 4________ 5_______6_____ 7______ 8_______ 9_______ 10_______IV.（综合题）We are all busy talking about and using the Internet, but how many of us know the history of the Internet?Many people are surprised when they find that the Internet was set up in the 1960s. At that time ,computers were large and expensive. Computer networks(网络) didn't work well. If one computer in the networks broke down, then the whole network stopped. So a new network system (系统) had to be set up. It should be good enough to be used by many different computers. If part of the network was not working, information(信息)could be sent through another part. In this way computer network system would keep on working all the time.At first,the Internet was only used by the goverment(政府),but,in the early 1970s, university(大学),hospitals and banks were allowed ( ) to use it too. Howerver,computers were still expensive and the Internet was difficult to become cheaper and easier to use. Scientists had also developed software(软件) that made "Surfing"(浏览）the Internet more convenient(方便).Today it is easy to get-on-line and it is said that millions of people use the internet every day. Sending e-mail is more and more popular among students.The Internet has now become one of the most important parts of people's life.（）1.The Internet has a history of ______ years.A.about 40B.less than 30C.more than 45D.nearly 35（）2.Scientists set up a new network system to _______.A. make the computer cheaper.e the computer widelyC.make the computer go wellD.develop new softwares（）3.The Internet was widely used in the ______.A.1960sB.1970sC.1980sD.1990s（）4.The underlined words "get-on-line" in Chinese means "________"A.上机B.上网C.接线D.买电脑（）5.Which of the following is NOT ture?A.In the 1960s computer networks system went wrong easily.puters are much cheaper than before.C.Today the Internet is used everywhere.D.People had enough softwares to get on-line fifteen years ago激活潜能围绕主题，实战应用V. （开放题）汉译英。