YOU SAID:
A bird flew into a tree and died.
INTO JAPANESE
鳥は木に飛んで、死亡しました。
BACK INTO ENGLISH
Bird flew to the tree and died.
INTO JAPANESE
鳥は木に飛び、死亡しました。
BACK INTO ENGLISH
Birds fly to the tree and died.
INTO JAPANESE
鳥は木に飛ぶ、死亡しました。
BACK INTO ENGLISH
Birds fly to the tree and died.
That didn't even make that much sense in English.