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QUICK ANSWER
"Why not" is a form of "why not", a phrase which is often translated as "por qué no". "Yeah" is an adverb which is often translated as "sí". Learn more about the difference between "why not" and "yeah" below.
why not(
way
nat
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. por qué no
Why are you studying on a Friday night? Why not do something fun?¿Por qué estás estudiando el viernes por la noche? ¿Por qué no haces algo divertido?
yeah(
yah
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
1. (colloquial) (affirmation)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a. sí
Did you finish all of your homework? - Yeah, I did it already.¿Terminaste de hacer toda tu tarea? - Sí, ya la hice.
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
2. (colloquial) (affirmation)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a. sí
Hey, kids, do you all want to go get ice cream? - Yeah!Oye, chicos, ¿quieren ir a comer helado? - ¡Sí!
