给教授发邮件请假
这封邮件是最好写的一类，因为它本来就该短。你不是在求人，也不需要在辩解什么，只是打个招呼。三四句话，语气是「我心里有数」，不是「快来救救我」。
Subject: Missing class on [date]
Dear Professor [Last name],
I wanted to let you know I'll miss [course name] on [date] due to [brief reason — e.g. being unwell / a family matter].
I'll get the notes from a classmate and review the slides, and I'll reach out if there's anything I need to catch up on. Let me know if there's anything specific I should do.
Thank you,
[Your name]
这封邮件在做什么：
· 理由一句话带过，不要展开。写满一段解释病情或家事，读起来像在找借口。
· 「I'll get the notes from a classmate」比任何道歉都有用。它说明你会自己补上，不给教授添活。
· 上课之前发，不是之后。提前打招呼是礼貌，事后补借口不是。
如果要缺的是实验课或考试
Dear Professor [Last name],
I'm sorry to say I won't be able to make the [lab / exam] on [date] because [brief reason].
Is there a make-up option or an alternative I could arrange? I'm happy to provide documentation if needed and to work around whatever works for you.
Thank you for your help.
Best,
[Your name]
批注：这种情况要主动问「有没有补考/补做的机会」，并且把决定权留给对方（「work around whatever works for you」）。不要自己提出方案然后要求对方配合。
大多数教授真正在意的只有一件事：你会不会悄无声息地掉队。只要你显示出「我已经想好怎么补上」，这封邮件就完成任务了。