Broken, thought, gone, ...
Roto, pensado, ido, ...
The past participle in Spanish is usually the same as the past tense. I thought, I had thought. But sometimes it is the same. I broke, I had broken. In English it is a different conjugation as a rule.
Take the -ar, -er, and -ir ending off of the infinitive and replace it with -ado (-ar verbs) or -ido (-er and -ir verbs).
Regular conjugation examples
Pensar >> pensado Comer >> comido Venir >> venido
Irregular conjugation examples
Romper >> roto Morir >> muerto