The way that you communicate with your teachers is of great significance, especially through emails. The followings are some tips for writing emails in courtesy.开学啦开学啦，PolyU connect邮箱又爆满啦。Orientations,recruitments and club activities，当然少不了来自professors们的邮件啦。当要给professors写邮件的时候，你是否会感到不知如何用英文得体且有礼貌地表达你想对教授说的话呢？不用担心，下面的几条小tips，一定可以帮到你！

Emails begin with different titles such as “Professor”or “Lecturer”. Basically, it doesn’t matter what “level” your teacher is; showing RESPECT through emails is appreciated by any level of teacher.

DO READ THE SYLLABUS. 如果你email里问的问题，professors已经提供了可以解决问题的材料，后果可能不只是让professors觉得你是个不认真的学生而已。

MAKE SURE EMAIL IS REALLY THEBEST WAY TO COMMUNICATE YOUR ISSUE. For example, emailing a professor and asking “what did I miss?” is not cool at all. 你只是在幻想professor会浪费时间给你再重头讲一遍课。What’s more, DON’T email to ask about your grades. Grades are better discussed in person so that the professor can show you exactly where in the assignment you fell short, not to mention the policy of universities.

USE YOUR ACADEMIC ACCOUNT.Professors are deluged with emails every day. By using school account, you’ll have a better chance of avoiding the spam filter, or professors skipping right over your “angrybirdhahahaha@xixi.com”account.

INCLUDE A MEANING FUL SUBJECTLINE. A good default is to start with your course department, number and section, and then the topic of your email, e.g. “APSS1L01 Seminar001: Questionabout the data collection for project”.当看到你的polyuconnect邮箱和一个与课程相关标题的邮件，professors在点击打开这封邮件前就知道你是谁以及你想要问些什么。.

ALWAYS USE A GREETING. Take “Dear Professor Last-name” for instance. If he or she signs the reply with a firstname, it is still better to address him or her as professor in an email. Don’tuse the professor’s first name unless you have been explicitly invited to doso. Of course, you should be sure to spell your professor’s name correctly.

BRIEFLY AND POLITELY STATE THEREASON WHY YOU ARE EMAILING. Get to the point right away.

When it comes to the ending, it is simple to use “regard”. 而Best wishes或者Good wishes也都是很不错的方式。假如是未见过面的professors，或者是连对方名字都不知道的staff,可以试试较有距离感的yours truly, yours faithfully。如果是不熟悉的知道名字的Professors，可采用sincerely家族。

READ IT OVER. Strive for apolite tone, concise language and clear purpose.

ACKNOWLEDGE THE ASSISTANCE. A simple “Thank you” may be enough.

  Thanks in advance很适合感谢对方帮你做事。 

  I look forward to your reply则算是相当正式且有礼貌的要求。

Be professional, respectful and use aproper tone are expected by most professors and instructors. Remember to be patient for the response from professors.有礼貌，言简意赅，耐心等那么一下下，就能收到professors的回复啦。用英文给professors写邮件是不是没有那么困难了呢？

References

http://www.wikihow.com/Email-a-Professor

https://ugr.ue.ucsc.edu/email_examples