6 ways to conlude a debate
(1)In conclusion i believe this is right because....
(2) This concludes that.....
(3) Afterall it is to be said that....
(4)This Statement (eg) Police should patrol more often should be one to be followed up because without more regular police controls the crime will spread even further then it already has.
(in number 4 if you use this you say your statement(what you believe)
(or are your point in the argument) and then your strongest example
why its a good way to finish: to show the judge or who ever is judging both sides that you have a good understand of the topic.
(5)In addition i would like to add that (eg) The Vietnam War didn't achieve anything and there are many sources to back this up.one is
the song i was only 19 by the band Redgum. The lyrics tell the devestating consequences of after the war and the effects of the troops
Number 5 (using a source shows and even deeper understanding of the topic.)
(6)Conclude your debate by disproving the opponent's point.(say i
disagree with the opponents views because eg(if the man who was suspected of killing his wife on their underwater honeymoon didn't do it then why did his diving tank say he never ventured over to her and that he casually rose to the surface. ( This is the most commonly used conclusion to a debate as you are saying that their(the opponents)side/ point of the debate is wrong which without even saying yours is
right pretty much sums up and concludes your view is right.
Hope this information helps you

Take care