Tom bought a book this morning .这句话改为被动语态时应用a book还是the book

Tom bought a book this morning .这句话改为被动语态时应用a book还是the book My mother bought me a book.改为被动语态是 I was bought a book by my LuXun wrote this book 改为被动语态 I have taken a book 改为被动语态 I had taken a book 如何改为被动语态啊 He gave me a book改为被动语态 He gave me a book 改为被动语态 I would take a book 如何改为被动语态 I had taken a book 改为被动语态 I can take a book 改为被动语态怎么改 I would take a book 改为被动语态 He was reading a book at this time yesterday.改为被动语态