【Emphasize Success, Not Mistakes.】
To increase the amount of success in a lesson, make sure your MAT DRILLS are speedy and rhythmical. Students should be able to say things naturally and with good pronunciation. DRILL the same thing two or three times then have the students USE the sentences by practicing in groups and pairs.
DRILL problem points several times during the lesson instead of concentrating on it for a long time. This will help remind students how to say it correctly.