Learning about Language国家获奖教案

Unit 3 Computers

Learning about Language

---the Present Perfect Passive Voice

Teaching aims:

1. Get students to know the structure of the present perfect passive voice. 2. Let students learn the usages of the present perfect passive voice. 3. Get students to become interested in grammar learning. Teaching important and difficult points: 1.

Help the students to sum up the structure and the usage of the present perfect passive voice. 2.

Guide the students to master the grammar item by completing various exercises. 3.

Apply the present perfect passive voice . Teaching methods: Observing,

analysis teaching, summing up Teaching Procedures: Step 1:

lead-in Say: Are you familiar with these computers? Can you call them? (ask the Ss to distinguish different types of computers.)

Do you know these new inventions of computer ?

A wrist-worn PC

has been invented recently. A pen-like computer has already been developed. Step2: Discovering Ask the Ss to discover whether these sentences have something in common.. Help them to learn the useful structure : the Present Perfect Passive Voice.

Step3: learning the structure 1.show them some pictures and ask them to make some sentences , using the Present Perfect Passive Voice. 2.Give some explanations 1构成：

主动语态

被动语态

现在完成时

have/has done ------------- have/has been done Ⅰ.概念：

1. 说话时已经完成

的动作或出现的结果。

2. 主语是行为动作的承受者。

【注意】

1. 过去分词前有两个助动词have/has和been。

2. 必须表示被动。

I have been told about it many times．

The bridge has just been built．

Ⅱ.句型：

1. 现在完成时被动语态肯定句句型：

主语+ have/has been +过去分词

Her motorbike has been stolen.

2. 现在完成时被动语态否定句句型：

主语+ have/has +not+ been+过去分词

The task has not been finished yet.

Ⅲ. 用法:

1. 表示一个被动的动作发生在说话之前,强调对现在

造成的影响和结果。

The door has been locked. 2. 表示一个被动的动作或状态开始于过去,持续到现

在,并可能持续下去,常与for 或since引导的时间状语

连用,或用于How long...?句型中。

The important problem has been discussed

for nearly two weeks. How long has the machine been used?

现在完成时的标志: recently /already/yet/ for+一段时间

/ since+时间点

【注意】

1. 只有及物动词才有被动语态,不及物动词(词组)没有被动语态。

例如:

happen, take place, die, appear, disappear, fail, remain, lie, last, sit, stand, break out, come true, belong to等。

What has happened to your brother? 2. 但许多不及物动词加介词或副词构成的动词短语，相当于及物

动词，也可以有被动语态。但动词短语是一个不可分割的整体，变为被动语态时,不可丢掉构成短语的介词或副词。

The child has been taken good care of by his grandma all these years. A notice has been put up on the wall. 3. 一些特殊动词, 如borrow, finish, begin, buy, start, return, marry, open, join等构成的现在完成时的被动语态不能与表示一段时间的状语连用。若要表达相应的意思, 则需改换动词或时态。

My brother has had(不能用has bought) this bike for almost four years. How long has this book been bought?

( false ) How long ago was this book bought?

( true ) Step4: Practice and exercises 1. 单项填空

1). —What’s

happening in the new area? —New houses _______ recently over there.

A. are built

B. built

C. have built

D. have been built 2). There is a police car in front of

our neighbor’s

house. What do you suppose _______?

A. did happen

B. has happened

C. is happen

D. has been happened A. has been set up

B. are set up

C. have been set up

D. was set up 2.改错

1）. A personal computer has bought by us.

A personal computer has been bought by us. 2）. Many problems has been found with our new computer. Many problems have been found with our new computer. Step5: Enjoy a poem Step 6: Homework Do Exercise 2

on Page 21.

3). This is one of the highest buildings that ______in our city recently.