Instructions
Make a list of your rebuttal's major points, mainly ideas in your opponent's argument that are invalid or weak in logic. You don't need full sentences, just the gist of an idea. Think of this as brainstorming, not writing.
Come up with a couple sentences that incorporate all of your main arguments against your opponent's position. The sentences do not have to be polished yet, but limit yourself to two succinct phrases.
Edit the two sentences, pulling out points that are either not directly connected to the main idea or are weaker. Cut it down to just one short statement that still conveys the main counterargument. Adjust your sentence so it sounds good as well. Remove any stilted language and awkward phrasing that may muddle your argument.