Quick answer
"For years" is a phrase which is often translated as "durante años", and "since" is a preposition which is often translated as "desde". Learn more about the difference between "for years" and "since" below.
for years
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (general)
a. durante años
They've been married for years, but they keep kissing all the time as if they were dating.Han estado casado durante años, pero se siguen besuqueando todo el tiempo como si fueran novios.
b. por años
They tried for years to have children, and eventually decided to adopt.Por años intentaron tener hijos, y finalmente decidieron adoptar.
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since(
sihns
)
A preposition is a word that indicates the relationship between a noun and another word (e.g. He ran through the door.).
1. (from a point in the past to the present)
a. desde
I have been working for this company since 2010.Llevo trabajando en esta empresa desde 2010.
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
2. (reason)
a. ya que
Since I'm the only one watching TV, pass me the remote.Ya que soy la única que está viendo tele, pásame el control remoto.
b. como
Since you don't like pizza, can I have your portion?Como no te gusta la pizza, ¿puedo tomarme tu porción?
c. puesto que (formal)
We didn't visit her since it was very late.No la visitamos puesto que era muy tarde.
3. (time)
a. desde que
I haven't seen them since they moved.No los he visto desde que se mudaron.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
4. (after that)
a. desde entonces
I met her for dinner, but I haven't seen her since.Cené con ella, pero no la he visto desde entonces.
5. (long ago)
a. hace mucho
He long since stopped talking to her.Hace mucho que dejó de hablarle.
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