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"They were" is a form of "they were", a phrase which is often translated as "fueron". "Yes" is an interjection which is often translated as "sí". Learn more about the difference between "they were" and "yes" below.
they were(
they
wuhr
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. fueron
Of course I know Alicia and Ryan. They were my neighbors for five years.Claro que conozco a Alicia y Ryan. Fueron mis vecinos durante cinco años.
a. estuvieron
Alex and Virginia had a wonderful time in Italy. They were there for two weeks.Alex y Virginia lo pasaron de maravilla en Italia. Estuvieron allá dos semanas.
a. eran
The pilgrims left for the New World because they were outcasts where they were living.Los peregrinos partieron para el Nuevo Mundo porque eran marginados donde vivían.
a. estaban
They were mad because they weren't invited to the party.Estaban enojados porque no los invitaron a la fiesta.
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).