YOU SAID:

I'm sitting in school and doing this...I have made mistakes

INTO JAPANESE

私は学校に座ってこれをやっています...私は間違いを犯しました

BACK INTO ENGLISH

I'm sitting at school doing this ... I made a mistake

INTO JAPANESE

私はこれをやって学校に座っています...私は間違いを犯しました

BACK INTO ENGLISH

I'm sitting in school doing this ... I made a mistake

INTO JAPANESE

私はこれをやって学校に座っています...私は間違いを犯しました

BACK INTO ENGLISH

I'm sitting in school doing this ... I made a mistake