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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 "yeah" and "I know" below.
yeah()
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!
I know()
A phrase is a group of words commonly used together (e.g., once upon a time).
