Here's why:
* Collective nouns refer to a group of individuals or things considered as a single unit (e.g., team, flock, committee). They typically have singular verb agreement.
* A book is not a collection of individuals or things, but rather a single entity. The pages are parts of the book, not individual entities within a group.
* We use singular verbs with "book": "The book is on the table."
Examples of collective nouns:
* Team: The team is playing well.
* Family: My family is coming for dinner.
* Jury: The jury reached a verdict.
Let me know if you have any other grammar questions!