period 4 grammar现在完成时的被动语态。
step1: studying aims(1min)
了解现在完成时的被动语态在具体语境中的运用。
step2:第一次先学。
课前预习。1. 现在完成时的构成。
2. 现在完成时的意义及常用时间状语。
3. 被动语态的基本构成。
4. 现在完成时的被动语态的构成。
step3:第二次先学。
观察思考 (方法指导：先翻译句子，再指出现在进行时被动语态的用法)（先学）（5mins）
1)现在完成时的被动语态的形式。
观察例句归纳。
computer has been repaired.
desks h**en’t been cleane.
the door been painted ?
归纳：肯定式。
否定式。疑问式。
step3：归纳规则students work in group to discuss the usage(15mins)
problem has already been solved.(某事物已经受到某种影响或某种处理)
has been told the news,so you needn’t call her.(人或物已经被动地接受某行为或某处理)
plan has been discussed for nearly 2 hours.(发生在过去，一直延续到现在并可能继续持续下去的被动动作或状态)
shouldn’t le**e school before your homework has been finished.(在时间。
或条件状语从句中，用现在完成时的被动语态代替将来完成时的被动语态)
注意事项。1. 现在完成时的被动语态的两个助动词h**e /has和been缺一不可。
2. 带有双宾语的动词，如give, send, bring, take, teach, show, tell, make, sing, writ,sell, buy, ask, pay, borrow, lend, offer, hand, pass, get, promise等，变为被动语态时，可将其中一个宾语变为主语，另一个保持不变。
主动：he has sent me an e-mail.
被动：i3.带有复合宾语（宾语+宾补）的动词变为被动语态时，只能把宾语变为主语，原宾补留在原处，省略to的不定式，被动语态中把to补上。
(1)主动：they h**e made mr. white leader of the team.
被动：mr. white
(2)主动：we h**e seen him enter the hall.
被动：hestep5 当堂检测（10mins）
1. every year a flood of farmers arrive in shenzhen for the money-****** jobs they before le**ing their hometowns.（2010福建）
a. promised b. were promised c. h**e promised d. h**e been promised
2. his sister left home in 1998, andsince.(09全国)
a. had not been heard ofb. has not been heard of
c. had not heard ofd. has not heard of
3. —the window is very dirty.
—i know. itfor weeks .
a. hasn’t cleaned b. din’t clean c. wasn’t cleaned d. hasn’t been cleaned
4. i need one more stamp before my collection
a. has completed b. completed c. has been completed d. is completed
5. in the last few years thousands of films allover the word.(2011天津)
producedb. h**e been produced
c. are producingd. are being produced
6. a lot of factories __since last year.
a. are being set upb. h**e been set up
c. had been set upd. will be set up
7. so far,the moon __by man already.
a. is visited b. will be visited c. has been visited d. was visited
8. i got caught in the rain and my suit
a. has ruined b. had ruined c. has been ruined d. had been ruined
9. -why does the lake smell terrible? ks5u
-because large quantities of waterks5u
polluted b. is being polluted c. has been polluted d. h**e been polluted
and where to go for the on-salary holidayyet.
a. are not decidedb. h**e not been decided
c. is not being decided d. has not been decided
we don’t know what was discussed ,yet we can feel the topic __
a. had changed b. will change c. was change been changed
then check the answers and deal with the difficult problems.
step6: homework
do exercise on the news*****.
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