向指导老师解释缺课原因是基本礼貌，如若可能，应提前告知。
It is a courtesy to instructors to explain absences to them, and if possible to inform them of absences ahead of time.
“很抱歉错过了上次的课程，”我这样开始，因为我觉得必须解释一下缺课的原因。 我要把真实的情况告诉他们。
“I’m sorry for having missed class the other day, ” I began, and because I felt obliged to explain my absence I told them the truth.
尽可能的和至少一个与你选了同一门课的同学交朋友，当你因为一些原因缺课时，你就会找到一个可以给你帮助的人；
Try to make friends with at least one person from each class that you take. That way you can help each other out when one misses class etc.
你缺课还有什么别的原因？
你知道他今天缺课的原因吗？
我缺课的原因是因为我传染了病毒。
在这堂课中，学生将识别常见类型的疾病，用一般过去式解释他们自己和其他人缺课的原因。
In this lesson, students will identify common types of illnesses, use simple past tense to explain why they and others were absent from school.
他说不出缺课的原因。
他说不出缺课的原因。
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