Use a volume which, in a quiet room, will reach easily to the back. Use humour and occasional jokes. If possible, move forward into the class, then back for writing on the blackboard. Repeat each student s question before answering it. This is a central matter of perception, epistemology and valuation.
Students know the difference.
Package the lecture to make it worthwhile. People will come to listen if you consistently have something worthwhile to say. Take into account last year s course evaluations. Give students input into the material to be covered. Reward class attendance.