YOU SAID:

i am going to eat donuts

INTO JAPANESE

私はドーナツを食べるつもり

BACK INTO ENGLISH

I'm going to eat the donut

INTO JAPANESE

私はドーナツを食べに行く

BACK INTO ENGLISH

I go to eat the donut

INTO JAPANESE

ドーナツを食べに行き

BACK INTO ENGLISH

Go eat a doughnut

INTO JAPANESE

ドーナツを食べに行く

BACK INTO ENGLISH

Go eat a doughnut