请帮忙把下列句子变为被动语态形式 谢谢...

题目

请帮忙把下列句子变为被动语态形式 谢谢...
1.Li Ming always takes care of the little girl when her parents are away from home.
2.We will have finished the book by end of next week.
3.They are building a new teaching building in front of the playground.
4.Before I returned , my mother had already cooked my supper.
5.I heard her make some commonplace remarks to her husband when she left the house.

答案

1.The little girl is always taken care of by Li Ming when her parents are away from home.
2.The book will have been finished by us by end of next week.
3.A new teaching building is being built by them in front of the playground.
4.My supper had already been cooked by my mother,before I returned.
5.I heard some commonplace remarks was made by her to her husband when she left the house.