Questions & Answers about Das Buch ist nicht teuer.
Why does nicht come right before teuer?
When you use nicht (not) to negate a specific adjective like teuer (expensive), it goes directly in front of that adjective.
Why do we use nicht here instead of kein?
Why doesn't teuer have an ending, like teures?
When an adjective comes after the verb to describe a noun (as in "The book is expensive"), it stays in its basic dictionary form. Adjectives only get special endings when they are placed directly before the noun.
Is Buch a neuter noun?
Yes! Buch is a neuter noun, which is why it uses the definite article das (the).