his/her diary
Me pregunto qué escribiría Rohit en su diario negro.
I wonder what Rohit would write in his black diary.
— Kal Ho Naa Ho (2003)
Decidió escribir todos los días en su diario.
She decided to write in her diary every day.
En su diario, lee, lee tú mismo su diario.
In his diary, read, read his diary yourself.
— Divorcio a la italiana (1961)
Trata de un tipo que escribe en su diario.
It's about a guy who writes in his diary.
Él decidió escribir en su diario todos los días.
He decided to write in his diary every day.