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QUICK ANSWER
"They did" is a form of "they did", a phrase which is often translated as "hicieron". "Yes" is an interjection which is often translated as "sí". Learn more about the difference between "yes" and "they did" below.
yes()
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).
they did()
A phrase is a group of words commonly used together (e.g., once upon a time).
a. hicieron
The kids can play now because they did their chores this morning.Los niños pueden jugar ahora porque hicieron sus tareas esta mañana.