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QUICK ANSWER
"Ellos" is a form of "ellos", a pronoun which is often translated as "they". "Por la tarde" is a phrase which is often translated as "in the afternoon". Learn more about the difference between "ellos" and "por la tarde" below.
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.
por la tarde(
pohr
lah
tahr
-
deh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. in the afternoon (from noon until sunset)
Sale de la escuela por la tarde.She gets out of school in the afternoon.
b. in the evening (in the latter part of the day before the sun goes down)
Vamos al ensayo de coro por la tarde.We go to choir practice in the evening.
