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"Since" is a preposition which is often translated as "desde", and "so that" is a phrase which is often translated as "para que". Learn more about the difference between "since" and "so that" below.
since(
sihns
)
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
preposition
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.).
conjunction
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.
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).
adverb
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.
a. hace mucho
He long since stopped talking to her.Hace mucho que dejó de hablarle.
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so that(
so
 
thaht
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. para que
I will give you money so that you can buy me a ticket.Te voy a dar dinero para que me puedas comprar un boleto.
b. a fin de que
I want to get married so that we can start a new life together.Quiero casarme a fin de que podamos empezar una nueva vida juntos.
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