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QUICK ANSWER
"No" is a form of "no", an adverb which is often translated as "no". "Creo que sí" is a phrase which is often translated as "I think so". Learn more about the difference between "creo que sí" and "no" below.
creo que sí(
kreh
-
oh
 
keh
 
see
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. I think so
¿Vas a ir al concierto esta noche? - Creo que sí.Are you going to the concert tonight? - I think so.
b. I believe so
¿Sabes la respuesta? - Creo que sí.Do you know the answer? - I believe so.
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no(
noh
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. no
¿Te gustó el concierto? - No, ese estilo de música no me gusta.Did you like the concert? - No, I don't like that style of music.
b. not
No está lloviendo.It's not raining.
c. non-
Una organización no gubernamental es una asociación que actúa con independencia del gobierno.A non-governmental organization is an association that operates independently from the government.
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Vamos a la fiesta esta noche ¿no?We're going to the party tonight, aren't we?
Firmaste el contrato ¿no?You signed the contract, didn't you?
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Deberíamos llamarlos ¿no?We should call them, shouldn't we?
Te acompaño ¿no?Why don't I come with you?
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. no
Quiero que limpies tu cuarto ahora mismo. - ¡No!I want you to clean your room right now. - No!
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