第1个回答 2005-11-11
This book belongs to (属于)them.
This book is theirs这种说法不妥。本回答被提问者采纳
第2个回答 2005-11-11
The book is theirs.
This is their's book.
第3个回答 2005-11-12
This book belongs to them
我觉得这样说没那么浓的中国味~
第4个回答 2005-11-11
This is their book.
第5个回答 2005-11-11
This book is theirs.