YOU SAID:

we are going to the store to buy bananas and apples

INTO JAPANESE

バナナとリンゴを買いに店に行きます

BACK INTO ENGLISH

Go to the store to buy bananas and apples

INTO JAPANESE

バナナとリンゴを買うために店に行きなさい

BACK INTO ENGLISH

Go to the store to buy bananas and apples