Here is a sample template you can use to write an advice letter for a teacher.
Today I write this letter to you, to impart some well-meaning advice. I have noticed some things that I think need change.
In my opinion, [state the particular advice]. It would be very convenient for you as well as others around you if you could incorporate this advice from now on.
It is after deep consideration that I am presenting this opinion to you. I hope only for the best by telling this. I am grateful for your approachable demeanor which has allowed me to send you this letter. I look forward to your kind consideration.
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