Unit 3 Traditional skills第 3 课时——语法课后拓展课时精讲栏目导航课时过关单元语法讲解：被动语态（The passive voice） （一）语态概述：英语中有两种语态：主动语态和被动语态。 1．主动语态表示主语是动作的执行者。巧记为：主动、主动、主去动。 Many people speak English. speak 的动作是由主语 many people 来执行的。 2．被动语态表示主语是动作的承受者，即行为动作的对象。巧记为：被动、被动、主被动。 English is spoken by many people. 主语 English 是动词 speak 的承受者。 （二）被动语态的构成 1．由 “助动词 be+及物动词的过去分词” 构成。人称、数和时态的变化是通过 be 的变化表现出来的。 一般现在时：am/is/are＋done 一般过去时：was/were＋done 一般将来时：will/shall be＋done（am/is/are going to be done） 过去将来时：would/should be＋done（was/were going to be done） 现在进行时：am/is/are being＋done 过去进行时：was（were）being＋done 现在完成时：have/has been＋done 过去完成时：had been＋done 歌诀是：被动语态 be 字变，过去分词跟后面。 2．含有情态动词的被动语态：由“情态动词＋be＋过去分词”构成。 歌诀是：情态动词变被动，情态加 be 加“过分”。 We can repair this watch in two days. →This watch can be repaired in two days. They should do it at once. →It should be done at once. （三）主动语态变被动语态的方法 1．主动语态的宾语变为被动语态的主语; 2．主动语态的谓语动词由主动语态形式变为被动语态形式; 3．主动结构的主语变为介词 by 的宾语，组成介词短语，放在被动结构的谓语动词之后。在无需说明动作的执行者或只强调动作的承受者时，by 短语可以省略。请看示范: 歌诀是：宾变主，主变宾，by 短语后面跟。 按照要求改写句子。 1．My friend helped me with my homework last week.（改为被动语态） 2．A new school will be built next year.（改为一般疑问句） My homework was helped by my friend last week. Will a new school be built next year? 3．He was stopped by a car on his way back home.（改为否定句） 4．This song is often sung by different people.（改为一般疑问句...
