YOU SAID:

My dad went to the store to get some milk but he hasn’t came back

INTO JAPANESE

父は牛乳を買いに店に行きましたが、戻ってきませんでした

BACK INTO ENGLISH

My dad went to the store to buy milk but didn't come back

INTO JAPANESE

父は牛乳を買いに店に行きましたが、戻ってきませんでした

BACK INTO ENGLISH

My dad went to the store to buy milk but didn't come back