ser/estar , be , was, were... - What is the past participle?

convertirse , become , became... - What is the past participle?

comenzar , begin , began... - What is the past participle?

morder , bite , bit... - What is the past participle?

romper , break , broke... - What is the past participle?

traer , bring , brought... - What is the past participle?

construir , build , built... - What is the past participle?

comprar , buy , bought... - What is the past participle?

elegir , choose , chose... - What is the past participle?

venir , come , came... - What is the past participle?