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  • Answered
    in the example you discribed , i suppose "不要离开" will be better in written form. It's more formal than the other.
    0 voted
    May 23, 2015
    0
  • Answered
    授课比较正式，多用于第三方书面。比如“汇报一下老师们的授课情况” 教课不怎么用，口语中说“讲课”比较常见。比如老师说“现在开始讲课了” 美女，有什么问题欢迎向我请教，我很专业的。
    0 voted
    May 23, 2015
    1