In an English test book I found the exercise
- That is a book. The book is thick. That book isn't thin. This is an interesting thick book.
Another one example
- This is a compuer. The computer isn't old. This compuer is new. This is a good new computer.
I know the rule:
Use the to refer something that has already been mentioned.
I understand it like this:
That is a book. - The book is being introduced for the first time. We use the indefinite article.
The book is thick. - The book is being introduced for the second time. So we use the definite article.
That book isn't thin. - "That" is a demonstrative pronoun. Before the word "book" we should use no article.
This is an interesting thick book. - Why is there an indefinite article? We mentioned the book for the third time. We know about this book. I thought the sentence must be like "This is the interesting thick book."
The first mention - a/an. The second (third/fourth) mention - the
Please explain this situation?
Maybe it is due to "This is an interesting thick book." We mentioned the book, not the interesting thick book/ So the interesting thick book is the new information for us.
I think I understand! Am I right?