Will he ever talk?

Coleman the man is 17 months old and a barrel of fun energy. He is so smart and pretty much can do anything you ask him to do. He will get his own dish out, help empty the dishwasher, find his shoes, etc. There is one thing he doesn't do...Talk. He grunts to tell you to look at something or if he needs something. He will make animal sounds and on a rare occasion you might hear him partially say a word. I have experienced this just once. I am not really concerned and daily we read books, talk about object and try to get him to talk. His only response is a scrunched nose smile. It is as if he is saying, "You crazy people want me to do what??"  I know that all of a sudden it will click and he will grace us with his words. Until then we have learned the multiple meanings of "UH! UH!