谁能帮我把下面的句子改为被动语态?

谁能帮我把下面的句子改为被动语态?
1.We speak Chinese here.
2.I finished my homework in two hours.
3.They were making a model plane.
4.They have finished the work.
5.We can change water into ice.
6.We must take down the notice quickly.
7.When will you paint the wall?
8.Have you found your book?
9.We have never heard of such things before.
10.A peasant woman brought the child up.