How: According to Researches, praises should be in a ratio of 4 to 1 criticism. praising can be by physical gestures (patting on the shoulder, Thumbs UP, "Clap", etc...), or verbal (GOOD JOB!, Excellent work!, etc...). when delivering a praise, use direct eye contact, open body posture, smiling face, positive attitude, get in the level of the student if possible too.