YOU SAID:

I am going to fight you after school today, prepare yourself.

INTO JAPANESE

私は今日放課後にあなたと戦うつもりです、自分自身を準備します。

BACK INTO ENGLISH

I'm going to fight you after school today, prepare myself.

INTO JAPANESE

今日は放課後にあなたと戦うつもりです。

BACK INTO ENGLISH

I'm going to fight you after school today.

INTO JAPANESE

今日は放課後に君と戦うつもりだ。

BACK INTO ENGLISH

I'm going to fight you after school today.