his/her/their past
No confíes en un hombre del que no sabes nada acerca de su pasado.
Don't trust a man whose past you know nothing about.
Tom tiene que enfrentarse a su pasado.
Tom has to face his past.
No sé nada acerca de su pasado.
I don't know anything about his past.
Alí tiene que enfrentarse a su pasado.
Ali has to face his past.
Decía que descubrió una forma de recordar su pasado.
He said he discovered a way to remember his past.
Hicimos averiguaciones en su pasado.
We investigated his past.