Unit 3 discovering useful structures （ppt课件）--2022新人教版（2019）《高中英语》必修第二册.pptx

1、现在完成时现在完成时的的被动语态被动语态Unit 3 Discovering Useful StructuresThe present perfect passive voice主语主语+have/has+V-过去分词过去分词(done)助动词助动词,无意义无意义 一一、现在完成时的结构现在完成时的结构Winter has already come(came,come)，will it still be far in spring?陈述句陈述句:主语主语+has/have（not）+done.一般疑问句一般疑问句:Has/Have+主语主语+done.?特殊疑问句特殊疑问句:特殊疑问词特殊疑问

2、词+have/has+done+.?He has gone to Beijing.(go-went-gone)have/has+not,可缩写为可缩写为havent/hasnt肯定回答：肯定回答：Yes,主语主语 have/has.否定回答：否定回答：No,主语主语 havent/hasnt.Where has he gone?现在完成时的的结构：现在完成时的的结构：肯定式：肯定式：主语主语+have/has+V-过去分词过去分词(done)否定式：否定式：主语主语+have/has+not+V-过去分词过去分词 一般疑问句一般疑问句：Have/Has+主语主语+V-过去分词过去分词？特殊疑问

3、句：特殊疑问句：疑问词疑问词+have/has+主语主语+V-过去分词过去分词.？二、现在完成时的二、现在完成时的用法用法(1)(1)表示到表示到现在为止现在为止已经完成已经完成或或刚刚完成刚刚完成的动作。的动作。Eg：Now we have planted all the trees.He has just come back.They have built many buildings in this city.Someone has broken the window.(窗户现在是坏的窗户现在是坏的)I have already lost the key.(我现在没有钥匙我现在没有钥匙)

4、I havent read that book yet.(不了解书的内容不了解书的内容)I have just cleaned my hands.(手是干净的手是干净的)二、现在完成时的二、现在完成时的用法用法(2)(2)表示表示过去发生的动作过去发生的动作,强调结果或强调结果或对现在的影响对现在的影响。常与常与already,yetalready,yet (到现在还没有到现在还没有),just),just (刚刚刚刚),),everever 等词连等词连用用.already:常用于肯定句中常用于肯定句中 yet:常用常用于于否定句否定句,疑问疑问句句尾尾She has learned Eng

5、lish for 5 years.她学英语有五年了。她学英语有五年了。He has lived in Beijing since（自从）（自从）5 years ago.他五年前就住在北京了。他五年前就住在北京了。二、现在完成时的二、现在完成时的用法用法(3)(3)表示表示从过去开始并持续到现在从过去开始并持续到现在的动作或状态，常与包括现在在的动作或状态，常与包括现在在内的一段时间的状语连用。内的一段时间的状语连用。forfor时间段（一段时间）时间段（一段时间）三、现在完成时的被动语态三、现在完成时的被动语态1.现在完成时的结构现在完成时的结构:主语主语+have/has+V-过去分词过去分

6、词（done）2.被动语态的结构被动语态的结构:be +V-过去分词过去分词（done）3.现在完成时的被动语态肯定式就是：现在完成时的被动语态肯定式就是：主语+have/has+been+V-过去分词been肯定式：肯定式：主语主语+have/has+been+done(V-过去分词过去分词)否定式：否定式：主语主语+have/has+not+been+done.一般疑问句一般疑问句：Have/Has+主语主语+been+done.？特殊疑问句：特殊疑问句：疑问词疑问词+have/has+主语主语+been+done.？现在完成时的被动语态的结构现在完成时的被动语态的结构The childr

7、en have already been told(tell)the good news.Have the children been told the good news yet?Who has been told the good news yet?否定句：否定句：The children have not/havent been told the good news yet.一般疑问句：一般疑问句：特殊疑问句特殊疑问句（对划线部分提问）：（对划线部分提问）：常与常与现在完成时现在完成时连用的连用的时间状语时间状语有：有：already 已经已经 yet 已经已经recently/late

8、ly 最近最近 since then 从那时起从那时起ever since 自那以来自那以来 ever 曾经曾经so far 迄今为止迄今为止 by now 到现在为止到现在为止for a long time 很长一段时间很长一段时间in recent years在最近几年里在最近几年里in/during/over the past/last years 在过去的几年里在过去的几年里 Change the sentences into the present perfect passive voice.Theyve built a kind of new PC with more functi

9、ons.A kind of new PC has been built with more functions.EXAMPLE Change the sentences into the present perfect passive voice.I have downloaded the software to help my phone battery last longer.Someone has lost an identity card.The software has been downloaded to help my phone battery last longer.An i

10、dentity card has been lost.Change the sentences into the present perfect passive voice.Have you confirmed the Wi-Fi password?Have you pressed the button yet to copy the file?Has anyone made a comment about the online database?Has the Wi-Fi password been confirmed?Has the button been pressed yet to c

11、opy the file?Has a/any comment been made about the online database?1.Paper money _(use)for over a thousand years.2._ the letter _(give)to Mr.Black?No.Its still on the desk.3.Great changes _(take)place in my hometown and a lot of factories _(set)up.has been usedHasbeen givenhave takenhave been setCom

12、plete the sentences.Complete the sentences.4.How long _(employ)at this job?Since 1999.5.When and where to go for the on-salary holiday _(not,decide)yet.6.I like these English songs and they _(teach)many times on the radio.7.All the preparations for the task _(complete),and were ready to start.have been taughthave been completed has not been decidedhave you been employedTHANKS