YOU SAID:

Why did Dad go to get milk, but he didn't come back?

INTO JAPANESE

なぜお父さんはミルクを取りに行ったのに、戻ってこなかったのですか？

BACK INTO ENGLISH

Why didn't my dad come back when he went to get the milk?

INTO JAPANESE

父がミルクを取りに行ったとき、なぜ戻ってこなかったのですか？

BACK INTO ENGLISH

Why didn't my dad come back when he went to get the milk?