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QUICK ANSWER
"I know" is a form of "I know", a phrase which is often translated as "sé". "Yeah" is an adverb which is often translated as "sí". Learn more about the difference between "I know" and "yeah" below.
I know(
ay
no
)A phrase is a group of words commonly used together (e.g., once upon a time).
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!
