Hai = Indicates singular presence , example: Woo acha aadmi hai. (He is a good fellow ) Hain = Indicates more than one presence, example: Woo achche loog hain ( They are good people) Hoon= Indicates presence , example: Mae acha aadmi hoon. ( I am a good fellow) Hey = Specially indicated, example: Woo hey acha aadmi hai. ( He is the nice fellow)