YOU SAID:

those birds were chirping loud today.

INTO JAPANESE

それらの鳥は今日大声で鳴いていた。

BACK INTO ENGLISH

Those birds were singing loudly today.

INTO JAPANESE

それらの鳥は今日大声で歌っていました。

BACK INTO ENGLISH

Those birds were singing out loud today.

INTO JAPANESE

それらの鳥は今日大声で歌っていました。

BACK INTO ENGLISH

Those birds were singing out loud today.