The word "book" in "because book" means "writing" and is a verb.
Original: When I tasted the students, I saw that it was slippery. Because that book is really half grass.
He once went to his house and saw one or more boxes smooth and clean, so he wrote on them, half in regular script and half in cursive script.
The word "book" in "Whose book is of vital importance to the world" means "calligraphy" and is a noun.
At first, I was sad because I said, "But this is Wang Youjun's book, in order to get rid of money."
The old woman was a little unhappy at first, so Wang Xizhi said to her, "As long as it is Wang Youjun's calligraphy, you can sell it for 100 yuan."