Try and put yourself in the teacher's shoes. The teacher is under the weight of an enormous responsibility and has an entire class to manage. read more
So yes, Its alright to talk back to your teacher if you know He isn’t right or justified in his deeds/teachings. Teachers are not saint. They are humans and they err too. read more
By talking while your teacher is talking, you're not only showing that you don't care; but that you will eventually be an unsuccessful employee in a certain job. Granted, talking once or twice while a teacher is talking doesn't mean that you're necessarily doing a bad thing. read more