I will buy ... for him/her
I’ll buy him/her a pitcher.
I’ll buy her a blouse.
I’ll buy him a pen.
I’ll buy this desk for him/her.
Quand je travaillerai, je lui achèterai des choses.
When I start working, I'll buy things for him.
— Pas un de moins (1999)
I’ll buy him a chick.
I’ll buy them a pencil case.
I'll buy her a dress.
Je lui achèterai du saucisson.
I’ll buy him some saucisson.
I'll buy him/her a frying pan.