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If u want to start debate first if u are individual then introduce yourself anf if u r in group den introduce ur grp give a brief information about ur topic on which u have to speak and then continue. And whenever u r addressing to ur oponent  use wrds like " mere priy mitr , mie aapki batien se shamat nhi hu " try to be polite as it influence the judge 

Hope it hlps... 
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