We can draw demand curves for firms in perfectly competitive and monopolistically competitive industries, but not for oligopoly firms.The reason for this is

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In oligopoly industries, firms' pricing decisions have a significant impact on their rivals' profits and market share. This means that an oligopoly firm's demand curve would not be a simple relationship between price and quantity demanded, as it would be affected by the reactions of its competitors. In contrast, for perfectly competitive and monopolistically competitive firms, the assumption that prices have no impact on rival firms' sales is more reasonable, allowing for the construction of traditional demand curves.

We Can Draw Demand Curves for Firms in Perfectly Competitive