I'm going to tell him or her
Je vais lui dire ce que je pense !
I'm going to tell him what I think!
— Le Voleur de bicyclette (1948)
What am I going to tell him?
Je vais lui dire que vous êtes là.
I'll tell him you're here.
Je vais lui dire que tu as dit ça.
I'll tell him you said that.
Tu crois que je vais lui dire ?
Do you think I'm going to tell him?
I'll tell him myself.
Je vais lui dire que ce n'est pas vrai.
I'm going to tell him/her that it's not true.
I'll have a word with him.
Je dois réfléchir à ce que je vais lui dire.
I need to think about what I'm going to say to him.
— Les Lundis au soleil (2002)