帮忙把下面的英语句子改为被动句，谢谢

1. Have the birds fed by anybody?
2. The children must be taken care of by someone when we go out.
3. Ways have been found by them to make waste water clean.
4 These magazines mustn't be taken out of the room.

请及时采纳，不懂继续问( 天天在线 ）
(*^__^*) 祝学习进步! 谢谢！

1 has the bird been fed by anyone?
2 the children must be taken care of by someone when we go out
3 ways have been found by them to make waste water clean
4 these magazines must not be taken out of the room.
希望能帮到您。

are the birds fed by anybody
the children must be taken care of by someone when we go out
the ways to make waste water clean were found