YOU SAID:

it is a nice day the birds are singing

INTO JAPANESE

鳥が歌っている良い日です

BACK INTO ENGLISH

It's a good day with birds singing

INTO JAPANESE

鳥の鳴き声が聞こえる良い日です

BACK INTO ENGLISH

It's a good day to hear the birds chirping

INTO JAPANESE

鳥のさえずりが聞こえる良い日です

BACK INTO ENGLISH

It's a good day to hear the birds chirping