（1）If we can't catch our teacher's words，we can't learn well.
（2）We should sit near the back of the classroom to hear the teacher well.
（3）We should not think about other things when our teacher is talking.
（4）We should look at our teacher when he or she is talking.
（5）If we can't understand something，we should learn by ourselves instead of asking a question.
（6）When the teacher isn't looking at us，we can do something else.