Why is it "Mi abuela sabia cocinar", but "Mi abuela supo cuidarme muy bien"? Shouldn't both sentences be in imperfect tense? My assumption is that the action is descriptive and doesn't have a definite start or end.
If the preterite supo is used then we see this action as something that happened during a time and had an end. If we use the imperfect sabía then we see this as more descriptive without paying any attention to when exactly that happened.
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