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интересная книга

interesting book

→ интересный
phrase Uncommon #22,868
interesting book The adjective changes its ending to agree with the noun and its grammatical case; интересную книгу is the accusative form.
RU: Это интересная книга?
EN: Is this an interesting book?

Любая интересная книга подойдёт.

Any interesting book will do.

Это жутко интересная книга.

This is a really fascinating book.

Это интересная книга?

Is this an interesting book?