YOU SAID:

i went to the shop to buy a green apple

INTO JAPANESE

私は青リンゴを買うために店に行きました

BACK INTO ENGLISH

I went to the store to buy green apple

INTO JAPANESE

青リンゴを買いに店に行きました

BACK INTO ENGLISH

I went to the store to buy green apples

INTO JAPANESE

青リンゴを買うために店に行きました

BACK INTO ENGLISH

Went to the store to buy green apples

INTO JAPANESE

青リンゴを買うために店に行きました

BACK INTO ENGLISH

Went to the store to buy green apples