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QUICK ANSWER
"Hey" is a form of "hey", an interjection which is often translated as "oye". "What are you doing?" is a phrase which is often translated as "¿Qué haces?". Learn more about the difference between "hey" and "What 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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What are you doing?(
wuht
 
ar
 
yu
 
du
-
ihng
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. ¿Qué haces?
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)
What are you doing? Can I help?¿Qué haces? ¿Te ayudo?
b. ¿Qué estás haciendo?
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)
What are you doing? It looks fun.¿Qué estás haciendo? Parece divertido.
c. ¿Qué hace?
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
(singular)
What are you doing? Would you like some help?¿Qué hace? ¿La ayudo?
d. ¿Qué está haciendo?
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
(singular)
What are you doing in the office so late?¿Qué está haciendo tan tarde en la oficina?
a. ¿Qué hacen? (plural)
What are you doing here?¿Qué hacen aquí?
b. ¿Qué están haciendo? (plural)
What are you doing out on the streets at this time?¿Qué están haciendo en la calle a estas horas?
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