请那位高手帮我把下面的英语改为被动语态,谢谢了

1. Coat can be used (by us) to keep warm.
2. Silk is produced (by people) in Hangzhou.
3.原句应该是: They opened the school in 2002.
The school was opened by them in 2002.
4. 原句应该是:They are writing a novel.
是writing 不是writting
A novel is being written by them.
注意是written.
5. A book has to be given by them to me.

有些错了,改一下

coat is used by usto keep warm
silk is produced in hangzhou
the school was opened in 2002
a novel is being writtten by them
a book is given to me by them

1. coat can be used to keep warm
2. silk is produced in Hangzhou
3. the school was opened in 2002
4. 这个句子你可能写错了吧
a novel is being written.
5. a book is needed to give to me.

Coats can be used to keep us warm.
Silk is produced in Hangzhou.
The school was opened in 2002.
A novel is being written by them.
I have to be given a book by them.

1.Coat can be used to keep