If you need to go into the teacher's office for something, you should:

First, knock gently before entering, whether the door is ajar or closed.

Two, shout the report softly when entering (necessary etiquette).

Third, walk up to the teacher at a normal pace and talk in a voice that only two people can hear.

Four. After asking, bow slightly to the teacher and leave the office softly.

Hope to adopt it~