This is a book.错在哪?

This is a book This is a nice book 哪错了? whose is this book 错在哪,为什么 Is this a book?" "Yes,this is." This is s book.(a book提问) this is a book 提问 This is a interesting book This is (a math) book. This book is sold quite well in this area 错在哪 This is a nice book哪里错了? This is a English book哪里错了 是用This have a book 还是用This is a book 在表示这有一本书时