vs 

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"Hello" is a form of "hello", an interjection which is often translated as "hola". "What are you doing?" is a phrase which is often translated as "¿Qué haces?". Learn more about the difference between "hello" and "What are you doing?" below.
hello(
heh
-
lo
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. hola
Hello! How is everything?¡Hola! ¿Cómo te va todo?
a.
Hello. Who is calling?Sí. ¿Quién es?
b. hola
Hello. - Hi, it's Ricardo.Hola. - Hola, soy Ricardo.
c. diga
Regionalism used in Spain
(Spain)
Hello. - Hi. Is Maria there?Diga. - Hola. ¿Se encuentra María?
d. aló
Regionalism used in Ecuador
(Ecuador)
Regionalism used in Panama
(Panama)
(Southern Cone)
Hello. Who is this?Aló. ¿Quién es?
e. bueno
Regionalism used in Mexico
(Mexico)
Hello? I can't hear you.¿Bueno? No te escucho.
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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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