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"El libro" is a form of "libro", a noun which is often translated as "book". "Ellos" is a form of "ellos", a pronoun which is often translated as "they". Learn more about the difference between "el libro" and "ellos" below.
el libro(
lee
-
broh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
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.
ellos(
eh
-
yohs
)A pronoun is a word that stands in for a noun (e.g., she).
b. them (after prepositions)
Si confías en ellos, dales las llaves.If you trust them, give them the keys.
c. them (in comparisons)
Mi hermano y yo somos tan altos como ellos.My brother and I are as tall as them.