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课件网) Section A (GF-4c) 1.hear of 听说 2.cut off 割掉;砍掉 3.cut down 减少 4.be harmful to对……有害 5.be good for…对……有益 6.at the top of 在……顶部或顶端 7. so far 迄今为止 8.take part in 参加 9.pay for 付费；付出代价 10.take action 采取行动 To review the use of The Present Continuous Tense, passive voice, Present Perfect and Modal Verbs Key words & phrases: take part in ,afford, turn off, reusable, pay for, take action, transportation Key sentences: 1.Have you ever taken part in an environmental project 2. We should help save the sharks. The river used to be clean. However, it is badly polluted. People are throwing rubbish to the river. Factories are putting waste into the river. The government has taken actions. Some laws are developed to stop the pollution. Everyone should take part in saving the earth. used to do sth 被动语态 现在进行时 现在完成时 情态动词 Work in groups and talk about one point . Group one The river used to be clean. Did the river use to be clean The river didn’t use to be clean. Yes,it did./ No, it didn’t. 1.结构 used to do sth didn’t use to do sth Did ...use to do sth Yes,...did./No,...didn’t. used to do sth 过去常常做某事，现在没做了。 use not to do sth Used... to do sth be used to doing sth 习惯于做某事。 be used to do sth 被用于做某事。 1.You used _____ (go) to school by bike，didn't you 2. 我习惯于晚饭后打篮球。 I ____ ____ ____ _____basketball after dinner. 3.这种小刀是用来切东西的。 This kind of knife ____ ____ ____ ____ things. 4.He used to spend much time playing computer games.（改一般疑问句） ____ ____ ____ ____ ____ much time playing computer games to go am used to playing are used to cut Did he use to spend Group two Some laws are developed to stop the pollution. These trees were cut down by the workers last night. In the future , more and more work will be done by the robots. I think teenagers should be allowed to choose their own clothes. 被动语态 被动语态构成 be +过去分词 一般现在时被动语态 am/is/are +done 一般过去时被动语态 was/were+done 一般将来时被动语态 will be +done 有情态动词被动语态 情态动词 +done 用括号内所给动词的适当形式填空。 1. The Secondary School Entrance Exam _____ (hold) in June. 2. A strange noise _____ (hear) by his mother last night. 3. A wide road _____ (build) between the two villages by those people next year. 4.Actions should_____(take) to protect the earth. is held was heard will be built be taken 一般现在时 一般过去时 一般将来时 情态动词 Group three Everyone should take part in saving the earth. He can’t play the guitar. They may have finished the task last month. 情态动词 1.情态动词+动词原形 2.情态动词没有人称和数的变化。 3. 常用的情态动词有：can/could, may/might, must/have to,should/ought to, would,need 等。 1. —Could you play the piano at the age of five —No, I _____. I started at six. A. can’t B. shouldn’t C. needn’t D. couldn’t 2. —Must I return this book before Friday, Sir —No, you _____, dear. ... ...
