Ii ko ni shite itara, omocha o katte ageru yo.

If you behave well, I will buy you a toy.

Kyō wa tanjōbi dakara, oishii kēki o katte ageru ne.

Since today is your birthday, I'll buy you a delicious cake.

Tesuto de hyakuten o tottara, gēmu o katte ageru yo.

If you get a perfect score on the test, I will buy you a video game.

Nodo ga kawaita no? Tsumetai jūsu o katte ageru ne.

Are you thirsty? I'll buy you a cold juice.

Kasa o motte inai nara, konbini de atarashii no o katte ageru yo.

If you don't have an umbrella, I'll buy you a new one at the convenience store.

Sonna ni sono hon ga yomitai nara, katte ageru.

If you want to read that book that much, I will buy it for you.