被动语态是一种动词形式，表示主语是动作的接受者，而不是发出者。下面是被动语态的知识点归纳和总结：
被动语态的构成：被动语态由助动词be（根据时态变化）加上动词的过去分词形式构成。例如：
现在被动语态：The book is written by him.
过去被动语态：The book was written by him.
将来被动语态：The book will be written by him.
被动语态的用法：使用被动语态可以使句子更加简洁，常用于不知道或不需要知道动作发出者的情况，或者为了强调动作的接受者。
不同时态的被动语态：被动语态可以根据需要用于不同时态，包括现在时、过去时、将来时、完成时等。
短语和结构的转换：一些常见的短语和结构可以转换为被动语态，例如：
进行时态：They are playing football. -> The football is being played by them.
完成时态：They have finished the work. -> The work has been finished by them.
情态动词：You must do it. -> It must be done.
含有动词不定式的结构：They are going to fix the car. -> The car is going to be fixed by them.
被动语态与动词：不同的动词有不同的过去分词形式，有些动词的过去分词形式是规则的（如write -> written），有些则是特殊的（如buy -> bought）。在使用被动语态时，需要注意动词的过去分词形式。
被动语态与动词短语：一些动词短语可以转换为被动语态，例如：
take part in -> part in
consist of -> consist in
take place -> take the place of
以上是被动语态的知识点归纳和总结，希望能帮助到您。
