Unit 5 Discover useful structures 课件-2022-2023学年高中英语人教版（2019）选择性必修第二册

UNIT5 FRIST AID Discovering Useful Structures [观察例句] 1.As you can imagine,getting burnt can lead to very serious injuries. 2.You can protect the burnt area by covering it with a loose clean cloth. 3.The first and most important step in the treatment of burns is giving first aid. 动词-ing 形式 getting为动词- ing形式在句中作主语。 covering为动词 -ing形式在句中作宾语。 giving为动词 -ing形式在句中作表语。 4.It is best to place burns under cool running water,especially within the first ten minutes. 5.If you see someone choking,first call the emergency services. 6.In 1974,an American doctor,Henry Heimlich,created the Heimlich manoeuvre,saving thousands of lives around the world. running为动词- ing形式在句中作定语 choking为动词- ing形式在句中作宾语补足语 saving为动词- ing形式在句中作状语 一、动词- ing形式的基本情况 1.动词- ing形式是动词的一种非谓语形式。 动词- ing形式在句中的语法作用:在句中作主语、宾语、表语和定语,动词- ing形式在句中作状语、宾语补足语和定语。 2.动词 -ing形式的时态和语态: Reading aloud is a good way to learn a language. 大声朗读是学习一门语言的一种好方法。 Having studied his lessons very hard,he passed the exam. 因为努力学习功课, 他通过了考试。 The building being built now will be finished next month. 正在建设的那座楼房将在下个月完工。 主动语态 被动语态 一般式 doing being done 完成式 having done having been done 时态 语态 动词-ing形式的主动式表示它逻辑主语时动作的执行者,其被动式表示它的逻辑主语是动作的承受者 二、动词- ing形式作主语 1.动词 -ing形式作主语时,往往表示经常性、习惯性的动作,通常置于句首。动词- ing形式作主语时,谓语动词用单数。 Saying is one thing,and doing is another. 说是一回事,做是另一回事。 _every day helps to make one keep healthy. 每天散步有助于一个人保持健康。 Climbing mountains _really difficult for the old. 对于老人来说爬山确实困难。 Having a walk is 2.形式主语it代替动词 ing形式作主语。 此类句式常见的有: It's a waste of time doing sth. It's useless/worthwhile doing sth. It's no good/use/fun doing sth. It is a waste of time_ persuade such a person. 试图说服这样一个人是浪费时间。 _the movie again. 这部电影值得再看一次 做某事是浪费时间 做某事没用/是值得的 做某事没好处/没用/没意思 trying to It is worth seeing 3.动词- ing形式和to do作主语时的区别。 动词- ing形式和to do都可以作主语。动词- ing形式作主语表示比较抽象的一般行为,to do作主语往往表示具体的或一次性的动作。 Playing with fire is dangerous. 玩火危险。(泛指) Singing is my hobby,and to sing at my friend's birthday party is my dream. 唱歌是我的爱好,在朋友的生日宴会上唱歌是我的梦想。 三、动词 ing形式作宾语 1.动词形式作宾语时,可位于(