Usage Note
libro is masculine, so it takes el and masculine adjectives: el libro nuevo. Don't confuse it with libra (pound/the sign Libra) or libre (free) — three different words. A bookshop is a librería, never a 'library', which is a biblioteca.
Examples
"Leo un libro interesante."
Natural Translation
I am reading an interesting book.
Literal Translation
I read a book interesting

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