If the child does not want to share his toys, he greedy? Or not? Child psychologists claim that it's not greed, but the usual sense of ownership. The child - is a person. You have to respect his right to property. If the child does not want to give the toy, it is his right and it is impossible to pick up and give strength.
Assume a situation - you approached a passer-and demands to give him your phone. You do not want to give, and now arrived, the police and forced to give the phone a passerby. What do you feel? So it is with children. But if you are asked to do a urgent call, you certainly without problems lend the phone for a while. Therefore, if you do not want to give her a toy, it is impossible to make. In this case as well it is important that the child knew what to take someone else's toys without permission can not. He must respect the feeling of the property of others.
Thus, the child is not required to give up their toys, if you do not want. But still there is another side to exchange toys. The child, who shares toys easier to make new friends. He has to learn to build their relationships with peers. Therefore, the child should be taught to change the toy for a while. Explain that at any moment he can take it back. But the child can also play new toy.