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Would you mind opening the window? - it's a request
Would you mind if I open the window? - it's asking for permission
Would you mind not smoking? - it's asking sb to stop smoking; or not to start doing it when we see sb is going to do it
Would you mind if I smoke? - it's asking for permission to smoke
"would you mind -ing" and "would you mind if" 
Is there any diference between:
Linear Mode
