vs 

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"Hello" is a form of "hello", an interjection which is often translated as "hola". "How old are you?" is a phrase which is often translated as "¿Cuántos años tienes?". Learn more about the difference between "How old are you?" and "hello" below.
How old are you?(
hau
 
old
 
ar
 
yu
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. ¿Cuántos años tienes?
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)
You look so young! How old are you?¡Te ves tan joven! ¿Cuántos años tienes?
b. ¿Cuántos años tiene?
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
(singular)
How old are you, Madam? If you don't mind me asking.¿Cuántos años tiene, señora? Si no le molesta decírmelo.
a. ¿Cuántos años tienen? (plural)
How old are you? I can't serve any of you alcohol if you are underage.¿Cuántos años tienen? No puedo servirles alcohol a ninguno de ustedes si son menores de edad.
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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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