Hi, my son is four years old, he is very active and sharp. He is very naughty at home. He loves school, he learns things and he also wants to learn more. But the big problem is that he does not talk to his teachers. He doesn't utter a word. I have seen it myself. He has does the same in pre school also I thought when he starts his proper school he shall be fine. But no he does not say anything not even yes or know. Kindly help me in this.