Quick answer
"Desde hace" is a phrase which is often translated as "for", and "atrás" is an adverb which is often translated as "behind". Learn more about the difference between "desde hace" and "atrás" below.
desde hace(
A phrase is a group of words commonly used together (e.g once upon a time).
1. (from a definite point in time)
a. for
Lo conozco desde hace más de 8 años.I have known him for more than 8 years.
2. (in a stretch of time)
a. in
Esta es la peor tormenta desde hace 150 años.This has been the worst storm in 150 years.
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An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (position)
a. behind
Hay un cobertizo atrás de la casa.There is a shed behind the house.
b. at the back of
La entrada está atrás del jardín.The entry is at the back of the garden.
2. (movement)
a. back
Hay que ir hacia delante y no mirar atrás.You have to move forward and not look back.
b. backward
Tropecé y me fui hacia atrás volando.I tripped and went flying backward.
3. (in time)
a. ago
Unos días atrás, estaba en Canadá.A few days ago, I was in Canada.
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