YOU SAID:

a bird can fly but, a fly can not bird

INTO JAPANESE

鳥は飛べますが、飛ぶことはできません

BACK INTO ENGLISH

Birds can fly, but cannot fly

INTO JAPANESE

鳥は飛べますが飛べません

BACK INTO ENGLISH

Birds can fly but not fly

INTO JAPANESE

鳥は飛べますが飛べません

BACK INTO ENGLISH

Birds can fly but not fly