YOU SAID:
im going to die of a fatal illness that will kill all of humanity
INTO JAPANESE
人類のすべてを殺す致命的な病気で死ぬつもりです
BACK INTO ENGLISH
I'm going to die of a deadly disease that kills all of humanity
INTO JAPANESE
私は人類のすべてを殺す致命的な病気で死ぬつもりです
BACK INTO ENGLISH
I'm going to die of a deadly disease that kills all of humanity
That didn't even make that much sense in English.