Around 3 to 4 years of age your child will be capable of indulging in associative play that is, he will be able to play with a group of children in a free-form style without a definite goal or much group interaction. For example, splashing water in a swimming pool, riding a tricycle in a group or running around in circles, or playing with building blocks. In these types of activities, your child interacts with other children and may at times share his toys, but each child is mostly engrossed in his own activity.
What you need to know:
You can organize play dates for your child with his friends. Associative play can be a great learning experience for your child where he picks up new behavioral patterns and social skills by being around his peers. It can also develop creative skills in your child when he plays without definite goals or set of rules. Eventually, your child will learn to play games with set structures and definite goals.