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QUICK ANSWER
"Why do you ask?" is a phrase which is often translated as "¿Por qué preguntas?", and "yes" is an interjection which is often translated as "sí". Learn more about the difference between "Why do you ask?" and "yes" below.
Why do you ask?(
way
du
yu
ahsk
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. ¿Por qué preguntas? (informal) (singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
Are you feeling OK? - Yes. Why do you ask?¿Te sientes bien? - Sí. ¿Por qué preguntas?
b. ¿Por qué pregunta? (formal) (singular)
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
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.
yes(
yehs
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
