YOU SAID:

So last year, I went to the store to get some milk. I'm wondering where my dad went.

INTO JAPANESE

それで去年、私は店に行って牛乳を買いました。私は父がどこに行ったのだろうかと思っています。

BACK INTO ENGLISH

So last year I went to the store and bought milk. I wonder where my father has gone.

INTO JAPANESE

それで去年私は店に行って牛乳を買いました。父はどこへ行ったのだろうか。

BACK INTO ENGLISH

So last year I went to the store and bought milk. Where did my father go?

INTO JAPANESE

それで去年私は店に行って牛乳を買いました。父はどこへ行ったの？

BACK INTO ENGLISH

So last year I went to the store and bought milk. Where did my father go?