vs 

QUICK ANSWER
"Yes" is an interjection which is often translated as "sí", and "Why do you ask?" is a phrase which is often translated as "¿Por qué preguntas?". Learn more about the difference between "yes" and "Why do you ask?" below.
yes(
yehs
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a.
Do you want coffee? - Yes, but just a little bit.¿Quieres café? - Sí, pero solo un poquito.
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a.
Yes! I knew I was right!¡Sí! ¡Sabía que tenía razón!
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
noun
a. el sí
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(M)
Vote "yes" to the construction of the new school.Vota "sí" para la construcción de la nueva escuela.
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Why do you ask?(
way
 
du
 
yu
 
ahsk
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. ¿Por qué preguntas?
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)
Are you feeling OK? - Yes. Why do you ask?¿Te sientes bien? - Sí. ¿Por qué preguntas?
b. ¿Por qué pregunta?
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
(singular)
Where were you on the night of the 14th? - I think I was at home, officer. Why do you ask?¿Dónde estaba usted la noche del 14? - Creo que estaba en casa, agente. ¿Por qué pregunta?
a. ¿Por qué preguntan? (plural)
Can we stay at the party until after midnight? - Why do you ask? You already know that the answer is no.¿Podemos quedarnos en la fiesta hasta después de la medianoche? - ¿Por qué preguntan? Ya saben que la respuesta es no.
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