被动句怎么改

1. 被动句的主语变为主动句的宾语，并且放在动词前面。

例：The cake was eaten by John.

改为主动句：John ate the cake.

2. 把被动语态中的"be"动词改为主动语态中的适当动词。

例：The book has been written by her.

改为主动句：She has written the book.

3. 把被动句中的动词过去分词改为主动语态中的动词原形。

例：The window was broken by the children.

改为主动句：The children broke the window.