Does he like to talk to you? How is his reciprocal speech?
My son finds reciprocal communication pretty hard - and sometimes he just states "I do not want to takl":) Especially when I ask about school, he likes school as well.
His expressive speech is great though, he just does not get back-and-forth part of conversation yet.
He is 4 years old
What have helped me - just wait for an answer - make sure that he understands that he has to respond when asked a question.....Do not be satisfied with no answer.....
Good luck
I am wondering if your child is suffering from Selective Mutism - a severe form of social anxiety. The best information on the internet is "selectivemutism.org" where I might suggest you read the FAQ's. If you think this might be the issue, please write back as I have extensive experience/knowledge in this area and should be able to help you.