YOU SAID:
my dad left for milk 20 years ago and never came back
INTO JAPANESE
私の父は20年前に牛乳を食べに行ったことがありません
BACK INTO ENGLISH
My father has never been to eat milk 20 years ago
INTO JAPANESE
私の父は20年前に牛乳を食べたことがありません。
BACK INTO ENGLISH
My father has never eaten milk 20 years ago.
INTO JAPANESE
私の父は20年前に牛乳を食べたことがありません。
BACK INTO ENGLISH
My father has never eaten milk 20 years ago.
You've done this before, haven't you.