The grammatical distinction between "does not work" and "is not working" lies in aspect and duration. "Does not work" is simple present tense, typically used to state a permanent condition, habitual failure, or a general fact (e.g., "This machine does not work without a filter"). In contrast, "is not working" uses the present continuous tense, indicating an ongoing, temporary, or active failure happening right now (e.g., "The refrigerator is not working properly today").
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