vs 

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"By now" is a phrase which is often translated as "ya", and "right now" is a phrase which is often translated as "ahora mismo". Learn more about the difference between "by now" and "right now" 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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right now(
rayt
 
nau
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. ahora mismo
Come here right now!¡Ven aquí ahora mismo!
b. ya
Get up right now!¡Levántate ya!
c. ahorita
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
(Latin America)
When did the movie start? - Right now. Just as you were coming through the door.¿Cuándo empezó la película? - Ahorita. Justo cuando tú entrabas por la puerta.
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