YOU SAID:

where did your dad go. OH yeah i forgot he went to get the milk

INTO JAPANESE

お父さんはどこに行ったの？ああ、ミルクを取りに行ったのを忘れた

BACK INTO ENGLISH

Where did your father go? Yeah, I forgot I went to get the milk.

INTO JAPANESE

お父さんはどこへ行ったの？ええ、ミルクを取りに行ったのを忘れたわ。

BACK INTO ENGLISH

Where did your father go? Yeah, I forgot I went to get some milk.

INTO JAPANESE

お父さんはどこへ行ったの？ミルクを取りに行ったのを忘れてた

BACK INTO ENGLISH

Where did your father go? I forgot I went to get some milk.

INTO JAPANESE

お父さんはどこへ行ったの？ミルクを取りに行ったのを忘れた。

BACK INTO ENGLISH

Where did your father go? I forgot that I went to get milk.

INTO JAPANESE

お父さんはどこへ行ったの？牛乳を取りに行ったのを忘れた。

BACK INTO ENGLISH

Where did your father go? I forgot that I went to get milk.