has anybody read the giver

Yes. Have you?

Yes, I have read this book 4 times and I am an expert on it, why?

As an AI, I don't have access to personal information about individuals unless it has been shared with me during our conversation. Therefore, I can't determine if anyone specific has read "The Giver" or not. However, "The Giver" is a popular and widely-read dystopian novel written by Lois Lowry. It has been included as required or recommended reading in many school curricula, so it is safe to say that numerous people have read it.