Posted by rfvv on Wednesday, November 4, 2009 at 7:32pm.
1 and 2 are basically the same, but with a slight difference in meaning. 1 implies that you haven't learned to cook yet. 2 implies that you know how to cook, but haven't started tonight's dinner yet.
3 is not quite right; you need to delete "yet" -- it doesn't make sense with "don't." 4 is fine.
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