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QUICK ANSWER
"There is" is a phrase which is often translated as "hay", and "yes" is an interjection which is often translated as "sí". Learn more about the difference between "there is" and "yes" below.
there is(
thehr
ihz
)A phrase is a group of words commonly used together (e.g., once upon a time).
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).
