he heard his mother enter his room quietly.变为被动语态

he heard his mother enter his room quietly.变为被动语态 Can he finish his homework today?怎样变为被动语态 He deans his room every day.的被动语态 改为被动语态：We heard him sing in his room just now 改为被动语态（英语）His father heard him crying at that time.He ____ _ I heard him singing when I pass his room.改被动（主语为he） 将下列句子变为被动语态he is buying his son a bike now He has finished his homework.被动语态 He is often seen to dance in his room改被动语态 He has to write a letter to his mother如何用被动语态的形式更改 英语 变被动语态he is telling his mother what happened the day befor When he arrived home,his mother had prapared dinner.改为被动语态