Basic of basic = The teacher's position that can control the student's mind. (2 Stand apart from the speaking student.)

acworksさんによる写真ACからの写真

... Continued from the previous blog.

Of course, you should warn students sometimes.

Hey Yukiko, Masaki seems to say "I don't want to hear you". You should talk toward one who doesn't want to hear from you."

Or,

Yukiko, just ask Masaki like, "What do you think about it, Masaki."

In some cases, you need to take these kinds of handling.
But, as I was writing in past several blogs, in the small situation, You must have an ability to control the student's awarenesses by shifting your basic standing position or something.