Must teachers punish pupils or not? As for me, teachers are created to teach and guide us. They must behave well in front of us, pupils. But we must behave respectfully as well. It doesn't mean that we must be impudent (наглый) if they don't punish pupils. Teachers are the same people as we are. We must admire them because they share their knowledge with us. Teacher is patient to pupils until they reach its limit. And if the teacher punishes someone of you, don't be surprised, please. It's obvious person's reaction. And, in general, teachers can punish their pupils but not so hard as they do.
My uncle is an engineer. He's very busy. His work day starts in the morning. He gets up at seven o'clock. He washes, dresses and has breakfast. After breakfast, he goes to work. He works at the Institute. He loves his job. He is married. His wife is a doctor. She works in a hospital. In the evening, she studies French. She visits the French language courses. My uncle doesn't speak French. He speaks Russian and German. He learns English. In the evening, he visits English language courses. The son of my uncle is a pupil. He goes to school. At school, he studies English.
And, in general, teachers can punish their pupils but not so hard as they do.