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"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(
yehs
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a.
Do you want coffee? - Yes, but just a little bit.¿Quieres café? - Sí, pero solo un poquito.
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a.
Yes! I knew I was right!¡Sí! ¡Sabía que tenía razón!
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
noun
a. el sí
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(M)
Vote "yes" to the construction of the new school.Vota "sí" para la construcción de la nueva escuela.
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they did(
they
 
dihd
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
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.
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