The aspect particle '过' placed immediately after a verb emphasizes past experience (have done before). Its negative form is '没(有)……过' and the question form is '……过没有?' or '……过吗?'.
When an action has already occurred, the '是……的' construction is used to highlight and focus on the specific time, location, manner, or agent. In affirmative sentences '是' can sometimes be omitted, but in negatives '不是……的', '不是' is compulsory.
Action-measure words combined with numerals serve as action-measure complements after the verb. '次' denotes frequency/times, '遍' emphasizes going through the whole process from beginning to end, and '一下儿' indicates a brief or casual action.
With '还/也', '除了……以外' means 'in addition to / besides'. With '都', it means 'except for / excluding'.
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