he
he finished his homework改为被动句？
finished his homework改为被动句？
把He finished his homework改为被动句是：
His homework was finished by him.
被动语态的基本结构是 ：
助动词be 及物动词的过去分词.
助动词be有时态、人称和数的变化。
所给的句子的时态是一般过去时，一般过去时态的被动语态的构成是：
助动词was/were 及物动词的过去分词。
所给的句子的谓语动词是finished,这是过去式形式，体现的时态是一般过去时，所以变为被动语态要用一般过去时态的构成。例句：
1.He saw a film yesterday.
→A film was seen by him yesterday.
wrote an article last night
→An article was written by Mary last night.
主动语态变被动语态加to的词？
感官动词
一感:feel
二听: hear sound
三使: make,let have
四看:look notice obverse watch
半帮助:help
新加:find.
这些词后直接加do
但是遇到被动语态时要加to
有情态动词时主动语态怎样变为被动语态，例句？
1、过去完成时主动语态 I had given him three books. S主语 had V过去分词 其他成分
2、转换成被动语态 Three books had been given to him by me. 宾语提前做主语 had been V过去分词。
3、过去完成时的被动语态有以下三种形式： (1)肯定结构：主语 had been done 其他成分 (2)否定结构：主语 had not been done 其他成分 (3)疑问句结构：had 主语 been done 其他成分
被动语态的主语是怎么来的？
He 主语 opened谓语动词 the door宾语，这是一个主动语态，意思是“他打开了门”。
The door 主语was opened谓语动词by him 宾语.意思是“门被他打开了”。
主动语态变被动语态的时候，就是把主动语态的宾语变成被动语态的主语，动词用被动结构，而主动语态的主语变成了介词by的宾语。