Unit 3 Computers

unit 3 computers
the 3rd period: learning about language
---the present perfect passive voice
goals: 1. learn the present perfect passive voice.
2. help the students master the way of using the correct voice, telling the differences between the active voice and the passive voice. 
teaching procedures:
step 1: revision and lead-in
1. check the homework first
ex1:
1 totally 　2 revolution 　3 artificial intelligence   4 birth　 5 simple-minded    6 go by  
7 deal with  8 network 　9 truly     10 anyway
ex2:
revolution; network; went by; totally; truly; simple-minded; anyway; deal with
ex3:
1  totally    2 amazed    3 exciting    4 excited 
5 cheaply   6 unlucky
2. 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.
(show them some pictures and ask them to make some sentences , using the present perfect passive voice.)
eg: it’s rather a hot day today! would you like to have a swim after school ?
have you ever swum in the blue water world（藍(lán)色水世界） in the oriental suntown (東方太陽(yáng)城) which has been set up in taizhou?
there a beautiful swimming pool has been built .
many high buildings have been set up.
lots of flowers and trees have been planted.
a new bridge has been completed….
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: discussion : learning the structure
give some explanations
1構(gòu)成：
                   主動(dòng)語(yǔ)態(tài)         被動(dòng)語(yǔ)態(tài)
現(xiàn)在完成時(shí)     have/has done----------have/has been done
he has been sent to study the new technology in the company.
the dirty clothes have not been washed.
have the windows been cleaned?
how many shopping centers have been built in this city?
2. 只有及物動(dòng)詞才有被動(dòng)語(yǔ)態(tài)，不及物動(dòng)詞（詞組）沒(méi)有被動(dòng)語(yǔ)態(tài), 如:happen, take place,
die, appear, disappear, fail, remain, lie, last, sit ,stand, break out, come true, belong to等.如：
what has happened to your brother?
3.但許多不及物動(dòng)詞加介詞或副詞構(gòu)成的短語(yǔ)動(dòng)詞，相當(dāng)于及物動(dòng)詞，也可以有被動(dòng)語(yǔ)態(tài)。