YOU SAID:

if fly fly then bird know no fly but bird meth fly so fly flee flew

INTO JAPANESE

飛ぶなら、鳥は飛ぶことを知らないが、鳥は飛ぶので飛ぶ

BACK INTO ENGLISH

If you fly, you don't know that birds will fly, but birds fly because they fly

INTO JAPANESE

あなたが飛ぶなら、あなたは鳥が飛ぶことを知らないが、鳥は飛ぶので飛ぶ

BACK INTO ENGLISH

If you fly, you don't know that birds will fly, but birds fly because they fly