YOU SAID:

im 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

私はあなたを打つつもりです

BACK INTO ENGLISH

I am going to hit 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.