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QUICK ANSWER
"She can" is a form of "she can", a phrase which is often translated as "puede". "Yes" is an interjection which is often translated as "sí". Learn more about the difference between "yes" and "she can" 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).