I am also a student and for what I learned you use mainly in 2 ways: 1- When it you replace a place that involves coming. For example: Je viens de Madrid. J'en viens. It goes with 'de'. 2- You replace de OB of the phrase and you are talk about something without specifying the quantitya.Eg: Je veux du sucre, j'en veux. That is how I studied it, please correct me if I'm wrong.
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