被动语态的语法知识点分析
导语：下面小编为您收集整理了被动语态的语法知识点，希望对您有帮助!
(一)被动语态的概念：
不知道或没必要提到动作的执行者是谁时用被动语态。强调或突出动作的承受者常用被动语态(by短语有时可以省略)。
(二)被动语态的构成方式：
be + 过去分词，口语只也有用get / become + 过去分词表示。
(三)被动语态的基本用法：
(1)使用被动语态时应注意的几个问题。
①主动变化被动时双宾语的变化。看下列例句。
My friend gave me an interesting book on my birthday.
An interesting book was given to me(by my friend)on my birthday.
I was given an interesting book (by my friend)on my birthday.
②主动变被动时，宾补成主补(位置不变);(作补语的)不定式前需加to。
The boss made him work all day long.
He was made to work all day long(by the boss)
③短语动词变被动语态时，勿要掉“尾巴”。
The children were taken good care of (by her).
Your pronunciation and spelling should be paid attention to.
④情态动词和be going to、be to、be sure to、used to、have to、had better等结构变被动语态，只需将它们后面的.动词原形变为be +过去分词。
⑤当句子的谓语为say、believe、expect、think、know、write、consider、report等时，被动语态有两种形式：(A)谓语动词用被动语态，动词不定式作主补。(B)用it作形式主语，真正的主语在后面，用主语从句来表示。如：
People say he is a smart boy.
It is said that he is a smart boy.
He is said to be a smart boy.
People know paper was made in China first.
It is known that paper was made in China first.
Paper was known to be made in China first.
类似句型有:It is said / known / suggested / believed / hoped/ thought that …
①所有的不及物动词或不及物动词词组，不能用于被动语态之中。
②表示状态的谓语动词，不能用于被动语态之中，如：last、hold、benefit、contain、equal、fit、join、mean、last、look like、consist to等。
③表示归属的动词，不能用于被动语态之中，如：have、own、belong to等。
④表示“希望、意图”的动词，不能用于被动语态之中，如：wish、want、hope等。
⑤宾语是反身代词或相互代词时谓语动词用主动语态，不能用被动语态。
⑥宾语是同源宾语，不定式、动名词等谓语动词不用被动语态。
⑦有些动词以其主动形式表示被动意义，特别是当主语是物时，常见的动词有sell、write、wash、open、lock等。
