九年级英语Unit3Period3.ppt

1、Unit 3 Teenagers should be allowed to choose their own clothes.,Period3,By 兵法传人,go,被动语态,英语的两大语态：主动语态和被动语态,A.主动语态中主语是谓语动词的发出者。宾语是谓语动词的对象。 B.被动语态中主语是谓语动词的承受者(动作的对象)。 (把主动语态改为被动语态也就是把主动句中的宾语改为被动句的主语，这是最关键的着眼点，同时谓语动词作相应的变化。) 被动语态的谓语构成: 助动词be动词过去分词 (根据句子的主语和时态，助动词be有am, is, are, was, were, been几个形式变化。) 什

2、么时候要用被动语态呢？ 在下列三种情况之一要用被动语态： 不知道动作的执行者是谁，用被动语态。 没有必要指出谁是动作的执行者，用被动语态。 需要强调动作的承受者时，用被动语态。,主动句中谓语动词的发出者由by引出，作为by的宾语，也可以省略。 请看以下主动语态和被动语态结构的转换： 主动语态:主语谓语宾语 被动语态: 例： We clean our classroom every day. （主动） 注意把主动语态改为被动语态时，句子的时态不能变。如上 例，所给的主动句子是一般现在时，改为被动语态时，也 要用一般现在时。 如果主动句中的主语是人称代词，改为被动句时作介词 by的宾语，要用宾格。

3、如上例中的主语we改为us。,主语,by+宾语,be+过去分词,Our classroom,is cleaned,by us,every day,（被动）,归纳总结方法,把主动语态改为被动语态可按“ 、 、 ”来进 行。即： 变把主动语态的宾语改为被动语态的主语，把主动 语态的主语改为被动语态的介词by的宾语。 套根据原句的时态套用相应时态。 注意注意人称的变化而引起的主谓一致问题。 例：Many people speak English. English by many people. He washed his shoes yesterday. His shoes by him yeste

4、rday.,is spoken,were washed,一变,二套,三注意,把下列主动句改为被动句,Lily writes many letters every day. (主动) They visited this farm last year.（主动） We have learned 3000 English words so far.（主动）,Many letters,are written,by Lily,every day.,This farm,was visited,by them,last year.,3000 English words,have been learned,by

5、 us,so far.,Period Three Section B 1a- 2c,What is happening ?,Do you ever get to class late? 2.study with friends? 3.finish a test early? 4.worry that youll fail a test ?,Do you ever get to class late?,Yes, I sometimes get to class late.,often (经常),usually(通常),always(一直,总是),sometimes(有时),never(从不),1

6、,2,3,4,5,”often, sometimes, never, always, usually”.,Do you ever get to class late? 2.study with friends? 3.finish a test early? 4.worry that youll fail a test ?,Listen and circle.,1.Peter is going to _ 2.He isnt allowed to _ 3.Peter wasnt allowed to _ 4.He could _ 5.He should be allowed to _,c,e,a,b,d,Listen and match,a. take