cara ngubah kalimat tanya menjadi pasif gmn?

21. whose pencil is taken by taita for writing?
22. who has been advised by the teacher?
23. who is helped by your mother?
24. by whom is this article written?
25. how many magazines have been torn by the children in the living room?
26. how much water has been drunk by your sister?
27. where are the trees planted (by them)?
28. has your bike been stolen by andy?
29. what is being read by father?
30. when is my book returned (by them)?

passive interrogative
(question word) + be + subject + past participle