How to write an email to a teacher

One thing I've been noticing is that many students have trouble communicating with their teachers in writing, in an appropriate and formal-enough way.

The way you communicate with your teachers can make a big difference in how (and if) they respond to a question, suggestion, or request.

For example, if one of my students emailed me and wrote
i dont know what the homework is can u tell me?!?!

my response, if I chose to respond at all, would probably be about a couple of things other than what the students wanted to know.
I would want to respond that a.) their messages to me need to have some element of formality, and b.) that they should write the homework in their planner during class when prompted, check the website if needed, and ask a friend before reaching out to me. In short, use their resources!

However, if they had already done those three things, and still needed clarification about an assignment, a much better way to go about asking for help would be to write

Hi Ms. Keenan,
I forgot the details of what the homework assignment is. I should have written down more  detail in my planner. I will plan to do that next time. I also checked the website and asked Student B already, but I'm still confused. Could you please let me know the details of the assignment? In the future, I plan to write down the homework in detail as soon as you tell us what it is. 
Thank you,
Student A 
​
Just a quick example, but I hope you get the point!