将下列句子改为被动语态 I gave a book to Mary last week.Do we use them for posting letters?
问题描述：
将下列句子改为被动语态 I gave a book to Mary last week.Do we use them for posting letters?
急
答
A book was given (by me) to Mary last week.
Are they used (by us) for posting letters?
括弧中的部分可以不写.谢谢，再问一下可不可以把括弧中的部分放最后