I will tell him/her
Je lui dirai demain que je l'ai bossé.
I'll tell him tomorrow that I worked him.
Je lui dirai que vous êtes passé.
I'll tell him you came by.
Un jour, je lui dirai que c'est toi.
One day, I’ll tell him/her that it’s you.
— Douleur et gloire (2019)
Simon a le car vidéo-mobile, je lui dirai de passer.
Simon has the mobile video unit; I'll tell him to stop by.
— Piège de cristal (1988)
Je lui dirai de vous rappeler après sa réunion.
I'll tell him to call you back after his meeting.
— In the Mood for Love (2000)
Je lui dirai que vous avez appelé.
I'll say that you called.