YOU SAID:

to kill oneself you have to knife stab

INTO JAPANESE

自殺するにはナイフで刺さなければならない

BACK INTO ENGLISH

To commit suicide, you must stab yourself with a knife.

INTO JAPANESE

自殺するにはナイフで自分を刺さなければなりません。

BACK INTO ENGLISH

To commit suicide, you must stab yourself with a knife.