YOU SAID:

I smacked my head on my desk and I had a great big bruise on my forehead

INTO JAPANESE

私の机で私の頭を叩かし、私の額に大きな大きなあざを持っていた

BACK INTO ENGLISH

And smacked my head on my desk and had a large large bruise on my forehead

INTO JAPANESE

私の机で私の頭を叩かし、私の額に大きな大きな傷があった

BACK INTO ENGLISH

Had a great big scar on my forehead, and smacked my head on my desk

INTO JAPANESE

自分のおでこに大きな大きな傷を持っていたし、私の机で私の頭を叩か

BACK INTO ENGLISH

Have a great big scar on my forehead had and smacked my head on my desk

INTO JAPANESE

おでこに大きな大きな傷があったし、私の机で私の頭を叩か

BACK INTO ENGLISH

Had a great big scar on your forehead and smacked my head on my desk

INTO JAPANESE

あなたの額に大きな大きな傷跡があり、私の机の上で頭を殴った

BACK INTO ENGLISH

There was a big big scar on your forehead and hit my head on my desk

INTO JAPANESE

あなたの額に大きな大きな傷跡があり、私の机の上で頭を打つ

BACK INTO ENGLISH

There is a big big scar on your forehead and hit your head on my desk

INTO JAPANESE

あなたの額に大きな大きな傷跡があり、私の机の上で頭を打つ

BACK INTO ENGLISH

There is a big big scar on your forehead and hit your head on my desk