Unit 13 We’re trying to save the earth

第二课时
( Focus on grammar)
情境引入 Leading-in
判断下列句子中使用了什么时态及情态动词。
1. We are trying to save the earth.
2. The river used to be so clean.
3. It was considered the nicest river in the town.
4. The air has become really polluted.\
5. We should help savew the sharks.
Answers:
1. 现在进行时 2. used to 3. 一般过去时的被动语态 4. 现在完成时 5. should
活动探究
Fill in the blanks
You can discuss
with your parnters
Answers:
延伸拓展
Fill in blanks with the correct forms of verbs.
Interviewer: ___________ you ever ________ (take ) part in an environmental project?
Ken: Yes, I have. I ___________ (help ) with a Clean-Up Day last year. It was _________ (consider) the biggest clean-up project this city __________ ever ___________ (have).
Interviewer: How many people __________ (take ) part?
Ken: I ________ ( think) more than 1,000 people ________ (come) to help out.
Interviewer: That’s fantastic! I guess everyone in this city is ____________ (try) to improve the environment.
Ken: Yes, evertone should _____________(play ) a part in keeping the city clean.
Possible answers:
Have taken, helped, considered, had had, took, think, came, trying, play
Fill in blanks with proper modal verbs.
can would could have to should might/may must
When it comes to saving the earth, people _______ think that big things __________be done. However, many forget that saving the earth begins with small things. For example, You _________ save electricity by turning off the lights when you leave a room. You ____ also use paper or reusable bags instead of plastic bags. In some stores, you now __________ pay for plastic bags. I think this is a great idea. And instead of driving to school or work, you ________ ride your bike or walk. If it’s far, you ________ take the bus. All these small things ______ add up and became big things that _____________ improve the environment. We can’t afford to wait any longer before taking action.
Possible answers:
may, can’t, can, could, have to, may/might, should ,would, must
随堂练习
Fill in blanks using proper forms of given words.
 1、I'll give the book to him as soon as he  _______  back(come).
 2、   ______    the baby _______   crying yet? (stop)
 3、I don't know whether mother ________   me to beijing next month.(take)
 4、she  ________   on her coat and went out. (put)
comes
Have
stopped
will take
put
5、 “What are they doing?”  “They _______  ready for the sports meeting.” (get)
 6、The boy asked his mother  ________   him go and play basketball.(let)
 7、I’m sorry to keep you  ________   for a long time. (wait)
 8、It  ______   (take) him half an hour  ________   (finish) his homework yesterday.
are getting
to let
waiting
took
to finish
9、If it   _______  an interesting film, we’ll see it tomorrow. (be)
 10、They usually _________  (do) their homework after supper.
 11、Listen! who __________   (sing) in the next room now?
 12、_______   (be) your parents in shanghai last year?
is
do
is singing
Were
13、Mr. yu ________   (teach) us maths since 1982.
14、They will have a trip (旅行) to the great wall if it ________  (not rain) tomorrow.
 15、Li Ming often ________  (listen) to the radio in the morning.
have taught
doesn’t rain
listens
Choose the best answers.
1．-May I stop my car here?
-No, you_＿＿＿.
A. can't B. mustn't C. needn't D. don't have to
A
2. -Must we clean the house now?
-No, you _______.
needn't B. may not
C. mustn't D. can't

3. Man __die without water.
A. will B. can C. need D. shall
A
A
4. –You____ return the book now. You can keep it next week if you like.
can't B. mustn't
C. needn't D. may not
5. -Johnny, you____ play with the knife, you___ hurt yourself.
won't...can't
B. mustn't...may
C. shouldn't, must
D. can't...shouldn't
C
B
小结与作业
1. Look back on what we have learned in this lesson.
2. Homework: make a conversation with your parnter about what you can do to reduce pollution.