YOU SAID:

I never looked at a squirrel in the morning before singing songs

INTO JAPANESE

朝、歌を歌う前にリスを見たことは一度もありませんでした

BACK INTO ENGLISH

I never saw a squirrel before singing in the morning

INTO JAPANESE

朝歌うまでリスを見たことはなかった

BACK INTO ENGLISH

I never saw a squirrel until I sang in the morning.

INTO JAPANESE

朝歌うまでリスを見たことがありませんでした。

BACK INTO ENGLISH

I had never seen a squirrel before singing in the morning.

INTO JAPANESE

朝歌うまでリスを見たことはありませんでした。

BACK INTO ENGLISH

I had never seen a squirrel until I sang in the morning.

INTO JAPANESE

朝歌うまでリスを見たことがありませんでした。

BACK INTO ENGLISH

I had never seen a squirrel before singing in the morning.

INTO JAPANESE

朝歌うまでリスを見たことはありませんでした。

BACK INTO ENGLISH

I had never seen a squirrel until I sang in the morning.