This is an irregular verb. It is a model verb.
PresentPresente
Ella escoge la ropa la noche anterior.
She picks out her clothes the night before.
ImperfectPretérito imperfecto
De niño, siempre escogía los libros más cortos.
As a kid, I used to choose the shortest books.
Present SubjunctivePresente de subjuntivo
Espero que escojan a Marta como representante.
I hope they choose Marta as the representative.