vs 

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"How do you do" is a form of "how do you do", a phrase which is often translated as "cómo lo haces". "Hello" is a form of "hello", an interjection which is often translated as "hola". Learn more about the difference between "how do you do" and "hello" below.
how do you do(
hau
 
du
 
yu
 
du
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. cómo lo haces (with a pronoun)
I love this yoga pose. - Wow! How do you do that without hurting your back?Me encanta esta pose de yoga. - ¡Vaya! ¿Cómo lo haces sin lastimarte la espalda?
b. cómo haces
How do you do your homework so late at night?¿Cómo haces tus deberes tan tarde en la noche?
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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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