How old is your child? It is not unusual for young children to participate in, what we call in education, parallel play. This is better defined as playing next to peers as opposed to interactively. If I read your post correctly, it sounds like your child has two years of preschool left? If your child is only 3, parallel play is normal from a developmental standpoint. I'd be more concerned with the teacher's knowledge of child development and credentials than my child.