However, please do inform me of any special circumstances, so that I will understand what is going on. Don't just disappear. My records show a very strong correlation between regular attendance and success in this course. You are expected to attend the first day of class, whether or not you are enrolled, and every day thereafter. You are responsible for everything said in class.
Punctuality is appreciated.
However, if you are late, please do come in. Better late than not at all. Please remain seated and attentive until class is dismissed. Please do not leave class early unless it is a medical emergency. Please do not talk or read newspapers during class.