3.Ask questions. If you can ask the right questions you can stay in control of the discussion and make your opponent scramble for answers. You can ask questions that challenge his point, ‘What evidence do you have for that claim?’ You can ask hypothetical questions that extrapolate a trend and give your opponent a difficulty, ‘What would happen if every nation did that?’ Another useful type of question is one that calmly provokes your foe, ‘What is about this that makes you so angry?’

4.Use logic. Show how one idea follows another. Build your case and use logic to undermine your opponent.