YOU SAID:

my dad went for milk fifteen years ago and never came back

INTO JAPANESE

私の父は15年前に牛乳を買いに行き、二度と戻ってこなかった

BACK INTO ENGLISH

My father went to buy milk 15 years ago and never returned.

INTO JAPANESE

私の父は15年前に牛乳を買いに行き、二度と戻りませんでした。

BACK INTO ENGLISH

My father went to buy milk fifteen years ago and never went back.

INTO JAPANESE

私の父は15年前に牛乳を買いに行きましたが、決して戻ってこなかったのです。

BACK INTO ENGLISH

My father went to buy milk fifteen years ago, but he never returned.

INTO JAPANESE

私の父は15年前に牛乳を買いに行きました、しかし、彼は決して戻りませんでした。

BACK INTO ENGLISH

My father went to buy milk fifteen years ago, but he never returned.