sentence: Although , one day later the headmaster found out the truth through CCTV , we refused to return to the school and decided to change to a new school as we know , even if we go back this time , similar cases could happen next time .
modified: Although , one day later the headmaster found out the truth through CCTV , but we refused to return to the school and decided to change a new school as we know even if we go back this time , similar cases could happen next time .
transformation: CONJ, PREP, PUNCT