From the lesson «When talking about two actions that happen simultaneously, you will use :
en + Participe présent / Gérondif»; can you not also use imparfait and passé composé eg Je courait quand j'ai rencontré Mathilde ? I am not suggesting the same meaning or English translation, but the sentence still describes the simultaneous occurrence of events, that could also be described using le gérondif. If that is correct, the quote from the lesson should replace 'will use' with 'can use' (and preferably reference the lesson on passé composé and imparfait being used together as another). If there are reasons to choose one over the other, worth noting as well.
I have changed 'will' to 'can use' in the body of the lesson but as this lesson is about forming and using le gérondif, I think suggesting other ways of describing simultaneous actions using other tenses would only serve to confuse learners.
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