For class , the class time is fixed, you can't chang your time.

如果您上的是小班的课程, 一般情况下是不可以改变的.

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The lecturer rarely missed class, changed class time , sent a substitute, arrived late, or left early.

教师很少缺课 、 调课 、 找人代课或迟到早退.

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I continue address unruliness in class , talking in class, visiting other students during class time etc.

我一直批评课上出现的散漫, 讲话, 随便下座位找其他同学的情况.

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