vs 

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"Hey" is a form of "hey", an interjection which is often translated as "oye". "How are you doing?" is a phrase which is often translated as "¿Cómo estás?". Learn more about the difference between "hey" and "How are you doing?" below.
hey(
hey
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
1.
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(used to attract attention)
a. oye
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
A word or phrase that is singular (e.g., el gato).
(singular)
Hey! What's wrong with you?¡Oye! ¿Qué te pasa?
b. oiga
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
A word or phrase that is singular (e.g., el gato).
(singular)
Hey! You can't park there.¡Oiga! Ahí no se puede estacionar.
c. oigan
A word or phrase that is plural (e.g., los libros).
(plural)
Hey! Don't step on the grass!¡Oigan! ¡No pisen el césped!
d. eh
Hey! You can't eat here.¡Eh! No se puede comer aquí.
e. ole
Regionalism used in Colombia
(Colombia)
Hey, don't talk to me like that!¡Ole! ¡No me hables así!
f. hala
Regionalism used in Colombia
(Colombia)
Hey, don't feed the dog!¡Hala! ¡No le des comida al perro!
g. momentito
Regionalism used in Argentina
(Argentina)
Hey, don't cut in line!¡Momentito! ¡No te cueles!
a. hola
Hey! How's it going?¡Hola! ¿Qué tal?
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How are you doing?(
hau
 
ar
 
yu
 
du
-
ihng
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
1.
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(used to address one person)
a. ¿Cómo estás?
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(singular)
How are you doing? - Fine, thanks.¿Cómo estás? - Bien, gracias.
b. ¿Cómo te va?
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(singular)
How are you doing? I hope that everything is well with you and your family.¿Cómo te va? Espero que las cosas les vayan bien a ti y a tu familia.
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