帮忙改成英语被动语态1 The woman asked the policeman for help2 The old

1.The policeman was asked for help by the woman.
2.A story is told by the old man on TV on Sunday.
3.Is the table used as a table by them?
（原句英语Do they use the box as a table ）
4.A collection was sent to me by her last week.
或 I was sent to a collection by her last week.
5.We aren't taught this math problem by teh teacher.(原句应为this math problem )