YOU SAID:
cookies are the best thing that brightens my day
INTO JAPANESE
クッキーは私の一日を明るくする最高のものです
BACK INTO ENGLISH
Cookie is the best thing to lighten my day
INTO JAPANESE
クッキーは私の日を明るくするために最高のものです
BACK INTO ENGLISH
Cookie is the best thing to make my day bright
INTO JAPANESE
クッキーは私の日を明るくするのに最高のものです
BACK INTO ENGLISH
Cookie is the best thing to make my day bright
Well done, yes, well done!