YOU SAID:

I’m going to beat you up

INTO JAPANESE

私はあなたを打ち負かすつもりです

BACK INTO ENGLISH

I am going to beat you

INTO JAPANESE

私はあなたに勝つつもりです

BACK INTO ENGLISH

I am going to win you.

INTO JAPANESE

俺は　君を殺す

BACK INTO ENGLISH

I am going to kill you.

INTO JAPANESE

俺は　君を殺す

BACK INTO ENGLISH

I am going to kill you.