Quick AnswerTo paraphrase properly, understand the original idea, set the source aside, and rewrite it in your own words and sentence structure, then cite it. Changing only a few words while keeping the original structure is still plagiarism.
Paraphrasing well shows that you understand your sources, and it is far more impressive to a marker than stacking quotations. Done badly, though, it becomes plagiarism. This guide shows you how to do it right.