What is your son's personality? Is he normally shy except around people he is very familiar with?
Usually, our DS wants to be the center of attention. If there's something he wants to say, he says it. He is usually pretty outgoing. But he did not participate much in preschool either. Sometimes I think it's basically just a big difference in interests of the kids.
You mention that they don't think he is participating the they thought he would. Are you also surprised by this apparent lack of participation?
I was very surprised. He usually likes to show what he knows. Although, I think he might also not want to stand out. So that might be an issue.
Thanks everyone for your support!