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QUICK ANSWER
"Let's go" is a form of "let's go", a phrase which is often translated as "vámonos". "Yes" is an interjection which is often translated as "sí". Learn more about the difference between "let's go" and "yes" below.
let's go(
lehts
go
)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).
