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QUICK ANSWER
"Yes" is an interjection which is often translated as "sí", and "that sounds great" is a phrase which is often translated as "qué buena idea". Learn more about the difference between "yes" and "that sounds great" below.
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).
that sounds great(
thaht
saunz
greyt
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. qué buena idea
Let's go to the movies and then eat dinner. - That sounds great!Vamos al cine y luego a comer. - ¡Qué buena idea!
b. me parece fantástico
How about going to the coast tomorrow? - That sounds great!¿Qué te parece ir a la costa mañana? - ¡Me parece fantástico!
a. suena muy bien
Listen to this new song I wrote. - That sounds great!Escucha esta nueva canción que escribí. - ¡Suena muy bien!