YOU SAID:

i masturbated with a knife

INTO JAPANESE

私はナイフで自慰行為

BACK INTO ENGLISH

I masturbate with a knife

INTO JAPANESE

私はナイフで自慰行為します。

BACK INTO ENGLISH

I will masturbate with a knife.

INTO JAPANESE

私はナイフで自慰行為をします。

BACK INTO ENGLISH

I will masturbate with a knife.