1、Unit 13 Were trying to save the earth 第二課時( Focus on grammar)情境引入 Leading-in判斷下列句子中使用了什么時態(tài)及情態(tài)動詞。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

2、. 現(xiàn)在進行時 2. used to 3. 一般過去時的被動語態(tài) 4. 現(xiàn)在完成時 5. should活動探究Fill in the blanksYou can discuss with your parntersask現(xiàn)在時過去時將來時過去將來時一般主動語態(tài)被動語態(tài)進行主動語態(tài)被動語態(tài)完成主動語態(tài)被動語態(tài)Can/couldMay/mightmustshallwillShould/ought toAnswers:ask現(xiàn)在時過去時將來時過去將來時一般主動語態(tài)ask / asksaskedshall/will askshould/would ask 被動語態(tài)am/is/are askedwas/

3、were askedshall/will be askedshould/would be asked進行主動語態(tài)am/is/are askingwas/were asking被動語態(tài)完成主動語態(tài)have/has askedhad asked被動語態(tài)have/has been askedhad been askedCan/could 表示能力，could主要指過去時間；表示允許。 May/mightmay表允許，might可以指過去時間，也可指現(xiàn)在時間，語氣更委婉。 must表示義務(wù)。意為“必須”（主觀意志） shall表征詢意見will表意愿，用于各種人稱陳述句；表請求，用于疑問句 Shoul

4、d/ought to應(yīng)該 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 _ (t

5、ake ) part?Ken: I _ ( think) more than 1,000 people _ (come) to help out.Interviewer: Thats 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, too

6、k, think, came, trying, playFill in blanks with proper modal verbs. can would could have to should might/may mustWhen 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 tur

7、ning 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 its far, you _ take the bus. All these sm

8、all things _ add up and became big things that _ improve the environment. We cant afford to wait any longer before taking action.Possible answers: may, cant, can, could, have to, may/might, should ,would, must 隨堂練習(xí)Fill in blanks using proper forms of given words.1、Ill give the book to him as soon as

9、 he _ back(come).2、_ the baby _ crying yet? (stop)3、I dont know whether mother_ me to beijing next month.(take)4、she _ on her coat and went out. (put)comesHavestoppedwill takeput5、 “What are they doing?” “They_ ready for the sports meeting.” (get)6、The boy asked his mother_ him go and play basketbal

10、l.(let)7、Im sorry to keep you _ for a long time. (wait)8、It _ (take) him half an hour_ (finish) his homework yesterday.are gettingto letwaitingtookto finish9、If it _ an interesting film, well see it tomorrow. (be)10、They usually _ (do) their homework after supper.11、Listen! who_ (sing) in the next r

11、oom now?12、_ (be) your parents in shanghai last year?isdois singingWere 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 taughtdoesnt rainlistensChoose the best answers.1-Ma

12、y I stop my car here?-No, you_.A. cant B. mustnt C. neednt D. dont have toA2. -Must we clean the house now?-No, you _.neednt B. may not C. mustnt D. cant3. Man _die without water.A. will B. can C. need D. shallAA4. You_ return the book now. You can keep it next week if you like.cant B. mustnt C. neednt D. may not5. -Johnny, you_ play with the knife, you_ hurt yourself.wont.cant B. mu