vs 

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"El cuaderno" is a form of "cuaderno", a noun which is often translated as "notebook". "El libro" is a form of "libro", a noun which is often translated as "book". Learn more about the difference between "el cuaderno" and "el libro" below.
el cuaderno(
kwah
-
dehr
-
noh
)
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. notebook
Saquen sus cuadernos y tomen notas.Take out your notebooks and take notes.
Lo que voy a explicar a continuación viene en el examen, así que abran sus cuadernos y tomen notas.What I'm about to explain will be on the test, so open your notebooks and take notes.
a. exercise book
Por favor, hagan los ejercicios en la página 33 de sus cuadernos.Please do the exercises on page 33 of your exercise books.
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el libro(
lee
-
broh
)
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. book
Leer un libro es perderse en otro mundo.To read a book is to get lost in another world.
Esperamos una hora para que el autor firmara nuestra copia de su libro.We waited an hour for the author to sign our copy of his book.
a. book
Contrataron a un contable para que llevara los libros de la empresa.They hired an accountant to manage the company's books.
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