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1、Unit 7 Protect the Earth IntroduceI can use _ to _.We should _.We should not _. Words“use + 名詞 + to + 動詞原形”意思是用某物做某種東西。 to后接動詞原形。常用短語： protect the earth 保護(hù)地球eg： She always uses too much water to clean things. 她總是用太多的水來清洗東西。小練習(xí)： In the past, we often _ (use) wood to make fire.useduse to Words(1)used

2、to表示過去常常做某事。 (2)be used to + doing： “習(xí)慣于”,to是介詞,后需加名詞或動名詞。 eg： I used to play football after school。 過去我常常在放學(xué)后踢球。Use to擴(kuò)展eg： Sarah is used to taking a walk。 Sarah習(xí)慣于散步了。 WordsShould “應(yīng)該” ,后接動詞原形,是較委婉地建議某人做某事。當(dāng)表示較委婉的拒絕某人做某事時(shí)：用其否定形式“shouldnt+ 動詞原形”。eg ： We should finish our homework every day. 我們每天都應(yīng)該

3、完成家庭作業(yè)。小練習(xí)： （ ）Water is useful, we _ reuse and save it. A. should B. shouldnt C. will Ashould /d/ Dialogues Group work：Write more sentences with learned sentences and report in class . Expand(1)(表示能力)能;會 can作情態(tài)動詞用法eg：She can drive，but she cant ride a bicycle. 他能開車,但是不會騎自行車。(2)(表示可能、許可)能夠;可以eg： You c

4、ant park your car in this street. 你不可以在這條街上停車。 Expandcould/be able to 區(qū)別could表示“原來具備某種能力,現(xiàn)在沒有這種能力了”。但was/were able to則表示過去成功地做成了某事。eg： I could swim all the way across the lake，but I cant now. 我原來能游過這個(gè)湖,但現(xiàn)在不能了。The fire spread through the hotel very quickly but everyone was able to get out. 大火很快蔓延了整個(gè)旅

5、館,但全體人員都脫離了危險(xiǎn)。 Summary Use toshould Exercise( )1.The oil is . A. use B. reuse C. useful( )2.To keep the air clean, dont to work every day. A. walk B. run C. driveCC Exercise( )3.We often use to clean things. A. coal B. oil C. water( )4.There some paper on the desk. A. has B. is C. areCB Exercise( )5

6、.People cut down trees every day. A. lot of B. many C. much( )6.We can use paper a toy plane. A. make B. making C. to makeBC Exercise( )7.There are plastic bags on the ground. A. too much B. too many C. so much( )8.To protect the Earth ,we should use . A. plastic bags B. plastic bottle C. glass bottleBC HomeworkCollect more examples of environmental damage, write a small report， report showing in the class.