The only ones that sound natural to me are (1) and (4). "
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petusekSTILL can be used in affirmative statements, negative statements, affirmative questions and negative WH-questionsYET can be used in negative statements (affirmative statements are possible, but contextually/stylistically more constrained), negative questions (both WH-questions and YES/NO-questions)ALREADY is restricted to affirmative statements and affirmative ques