YOU SAID:

I went to the store to purchase some spoiled sour milk

INTO JAPANESE

いくつか酸っぱい牛乳を購入する店に行きました

BACK INTO ENGLISH

I went to the store to buy some sour milk

INTO JAPANESE

酸っぱい牛乳を買うために店に行きました

BACK INTO ENGLISH

Went to the store to buy sour milk

INTO JAPANESE

酸っぱい牛乳を買いに店に行った

BACK INTO ENGLISH

Went to the store to buy sour milk