YOU SAID:

I wish my dad came back with the milk

INTO JAPANESE

お父さんがミルクを持って戻ってきてくれればいいのに

BACK INTO ENGLISH

I wish my dad would come back with milk

INTO JAPANESE

お父さんがミルクを持って戻ってくるといいのですが

BACK INTO ENGLISH

I hope daddy comes back with milk

INTO JAPANESE

パパがミルクを持って戻ってくるといいですね

BACK INTO ENGLISH

I hope daddy comes back with milk