YOU SAID:

once upon a time there was a green man and he had to go back o the future

INTO JAPANESE

むかしむかし緑の男がいて、未来に戻らなければならなかった

BACK INTO ENGLISH

Once upon a time there was a green man who had to go back to the future

INTO JAPANESE

むかしむかし未来に戻らなければならない青年がいた

BACK INTO ENGLISH

Once upon a time there was a young man who had to return to the future

INTO JAPANESE

むかしむかし、未来に戻らなければならない青年がいた

BACK INTO ENGLISH

Once upon a time there was a young man who had to return to the future