YOU SAID:

sometimes I get sad for reasons which even i can't comprehend

INTO JAPANESE

時々私は理解できない理由で悲しくなる

BACK INTO ENGLISH

Sometimes I get sad for the reason I can not understand

INTO JAPANESE

理解できない理由で悲しくなることがあります

BACK INTO ENGLISH

Sometimes it makes me sad for reasons I can not understand

INTO JAPANESE

理解できない理由で悲しくなることがあります

BACK INTO ENGLISH

Sometimes it makes me sad for reasons I can not understand