Answer:
Respect the teacher.
The sentences which do not have any subject in them, their passive form usually include the word "Let".
Hence, The sentence structure is like:
Let + object + be + past participle.
This would make the above sentence as:
Let the teacher be respected.
![\rule[225]{225}{2}](https://img.qammunity.org/2022/formulas/mathematics/high-school/3icqlwn6du2l5ygbr7z2lp6sjjralcpq09.png)
Hope this helped!
~AH1807
Peace!