Breakdown of Fui yo quien le pegó al chivato en el parque.
yo
I
ser
to be
en
in / on / by (means of transport) / about (after pensar)
el parque
the park
a
personal a (marks a person object)
le
to him / to her / to you (formal) / him (direct object, male person)
quien
who, whom
el chivato
the snitch
pegar
to hit (strike)
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