1) the two tenses in French don't correspond neatly to equivalent
tenses in English.
2) the difference is not bound by hard and fast rules: there
are times when both might be grammatically
correct (although the meaning might be different, especially the
connotations, depending on which tense
you choose).
3) the difference between them is conceptual: it relies on an
understanding of aspect, which is never
taught in English classes, even though English is full of them
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