SER / ESTAR
BE - WAS/WERE - BEEN
TRAER
BRING - BROUGHT - BROUGHT
ROMPER
BREAK - BROKE - BROKEN
EMPEZAR
BEGIN - BEGAN - BEGUN
CONSTRUIR
BUILD - BUILT - BUILT
BATIR
BEAT - BEAT - BEATEN
VOLVERSE / CONVERTIRSE
BECOME - BECAME - BECOME
SOPLAR
BLOW - BLEW - BLOWN
COMPRAR
BUY - BOUGHT - BOUGHT
MORDER
BITE - BIT - BITTEN