Unit 13 We’re trying to save the earth! Section A3 (Grammar focus-4c) 【学习目标】 1．学习并掌握新词汇：reusable，afford，transportation 2．学习并会用以下常用表达：try to do sth.，used to do sth.，is/are doing，be considered，take part in，help with，help out，turn off，instead of，pay for，add up，afford to do sth.，not…any longer，take action，It's difficult for sb. to do sth. 3. 复习现在进行时，被动语态，现在完成时，情态动词，used to do的用法。 【重点和难点】 正确使用本课语法要点。 【课前预习】 一. 用can，may，must，need或have to的适当形式填空。 1. You ____ return the book to the library on time. 2. I ____ find the way to the hospital. ____ you show me the way? 3. —____ I finish the work right now? —No, you ____. You ____ do it later. 4. He said he ____ come tonight. 5. Her mother was ill. She ____ stay at home and look after her. 6. It's time for class. You ____ stop playing football or you ____ be late for class. 7. The cloud is lifting，so it ____ be a rainy day tomorrow. 8. The desk is not dirty. You ____ clean it. 9. —What is your mother going to do this Saturday? —I'm not sure. She ____ go to see my grandmother. 10. If the traffic light is red，you ____ cross the road. It's dangerous. 二. 用括号内所给单词的适当形式填空。 11. We don't need ____ (work) today. 12. He doesn't dare ____ (break) his promise. 13. Some students are used to ____ (ask) their parents for help when they meet trouble. 14. There used ____ (be) a quiet village here. 15. You will be used to ____ (live) in the countryside. 16. All of us know that cotton can be used ____ (make) cloth. 17. You used ____ (go) to school by bike，didn't you? 三. 根据汉语意思完成句子，每空一词。 18. 这本书一定是汤姆的，他的名字在封面上。 This book ____ ____ Tom's. His name is on the cover. 19. 他可能被一个五岁的小男孩愚弄了吗？ ____ ____ ____ true that he was fooled by a five-year-old boy? 20. 你的车需要维修了。 Your car ____ ____. 21. 这种小刀是用来切东西的。 This kind of knife ____ ____ ____ ____ things. 22. 我年轻的时候常常打篮球。 I ____ ____ ____ basketball when I was young. 23. 他过去常花很多时间玩电脑游戏吗？ ____ ____ ____ ____ ____ much time playing computer games? 【合作探究】 探究一 仔细阅读课本P100，并在书上查找这些短语并标记。 1） be considered 被认为是 2） improve the environment 改善环境 3） can’t afford to do sth. 负担不起做某事 4） begin with small things 从小事做起 5） add up 加起来，聚少成多 6） use public transportation 使用公共交通 探究二 观察下列例句，总结语法规则。 1. 现在进行时 Now people are taking actions to save wild animals. Let’s join them. Look! Kenny is swimming happily in the pool. Listen to me carefully. I am talking about something very important. Be quiet please! The baby is sleeping. 总结: 现在进行时表示： 谓语构成： + 标志性词汇： 现在分词的构成规则： 2. 现在完成时 He has kept this book for over two months. Please ask him to return it soon. We have lived here since my little sister was born. Have you ever been to Australia? It’s a beautiful country ... ...
