But to the issue again... Should I became a teacher I would ask many questions in class so that student to concentrate, and when they made mistake, they will strongly remind themselves of that.

学生在堂上回答不了问题或屡答屡错，本身已觉得非常丢脸，老师轻责则可，若冷言冷语甚至当众取笑，都会伤尽孩子的心。