vs 

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"By now" is a phrase which is often translated as "ya", and "so far" is a phrase which is often translated as "hasta ahora". Learn more about the difference between "by now" and "so far" below.
by now(
bay
 
nau
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. ya
He should be here by now.Ya debería estar aquí.
b. a estas alturas
You should have graduated by now.A estas alturas, deberías haberte recibido.
c. a estas horas
He probably knows by now that he can't fire judges he disagrees with.Probablemente sabe a estas horas que no puede despedir a los jueces con los que no está de acuerdo.
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so far(
so
 
far
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. hasta ahora
Our program has helped 300 families so far.Nuestro programa ha ayudado a 300 familias hasta ahora.
a. por ahora
How's the new house? - So far everything's going well.¿Qué tal la nueva casa? - Por ahora todo va bien.
a. hasta cierto punto
I used to be a salesman, but I could only go so far before I burned out.Antes era un dependiente, pero solo pude llegar hasta cierto punto antes de agotarme.
a. tan lejos
I didn't realize it was so far.No me di cuenta de que era tan lejos.
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