Answer:
When you write an academic essay, you make an argument: you propose a thesis and offer some reasoning, using evidence, that suggests why the thesis is true. When you counter-argue, you consider a possible argument against your thesis or some aspect of your reasoning. This is a good way to test your ideas when drafting, while you still have time to revise them. And in the finished essay, it can be a persuasive and (in both senses of the word) disarming tactic.
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