я куплю ему

I will buy him

→ я
phrase Rare #27,140
I will buy him Used with a masculine person or recipient; ему means “to him.” The object being bought usually follows or is understood from context.
RU: Я куплю ему билет на поезд.
EN: I will buy him a train ticket.

Я куплю ему очки в другой раз.

I'll buy him glasses another time.

— Элитный отряд (2007)

Я куплю ему карандаш.

I’ll buy him a pencil.

Я куплю ему ремень.

I’ll buy him a belt.

Я куплю ему отвёртку.

I’ll buy him a screwdriver.

Я куплю ему чемодан.

I’ll buy him a suitcase.

Я куплю ему подарок.

I’ll buy him a gift.

Я куплю ему новый.

I’ll buy him a new one.

Я куплю ему футболку.

I’ll buy him a T-shirt.