Some people will more readily make that response audible than others, but response is the natural consequence of the listener, whether it is voiced or not. First, they must catch the attention of the student and then they must have a means of holding that attention. This means that they must be interesting . What is said must be worth listening to. It means that they must use a variety of teaching methods.
People respond to something new or unexpected.
It also means that the student should be involved . Good specific questions that can be easily answered or that will motivate discussion should be asked throughout the lesson and assignments should be made. Students who become involved in the lesson will be good listeners. Good adult classes in which students truly listen and participate require hours of preparation and effort on the part of the teacher. It requires ingenuity to devise assignments for various class members to complete.