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