牛津高一英语M4U3 Tomorrow's world学案

The old bridge is said to have been built in the early 1930s.　　

二）．情态动词的被动语态　　

情态动词被动语态的结构为：　　

一般式：情态动词（can,could,may,might,must,should,need等）+ be+过去分词.　　

完成式：情态动词（can,could,may,might,must,should,need等）+ have+ been+过去分词。例如：1）You  needn’t mention his plan in your speech.-----    His plan needn’t be mentioned in your speech.　　

 2）You might have completed your task ahead of time.----Your task might have been　　

 completed ahead of time.　　

三．被动语态的特殊情况：　　

1. 含有动词短语的主动句变为被动句时，不要漏掉其后的介词或副词。例如：　　

1） We must take good care of the children.------- The children must be taken good care of.　　

2. 被动语态常在不知道动作的执行者或者是要强调动作的承受者时才用。助动词be有时可被系动词get替换，即“get+过去分词”，也可表示被动概念。例如：　　

1） You are wanted on the phone.　　

3. 固定结构be going to,used to,have to,had better等在变为被动句时，只需将其后的动词变为被动形式即可。例如：　　

 The little boy used to send newspapers here.-------Newspapers used to be sent here by the little boy.　　

 4.“宾语+补语”又叫复合宾语，变被动语态时，只讲宾语变为被动句的主语，补语位置保持不动，但是其变为主语补足语了。例如;　　

 Someone caught the boy smoking a cigarette in the toilet.------The boy was caught smoking a cigarette in the toilet.　　

5在使役动词have,make,get以及感官动词see,watch,notice,hear,feel,observe等后面用动词不定式作宾语补足语时，主动结构中不定式符号to要省略，但变为被动结构时，要加to.例如：　　

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