When I'm talking to him, he very often says 'what did you say?' and I have to repeat myself sometimes up to 4 times before he's satisfied. DH thinks he's just processing stuff. I'm not sure.
He doesn't listen to me much and it's difficult to get him to communicate unless it's about something he loves or playing a role playing game. At one point (though he seems to be growing out of this) he could be a few different characters throughout the day & I would have to ask to speak to my DS before he would answer questions. He also gets upset & makes strange noises/shouts/growls when I try to force him into conversation (lol, it's not as bad as it sounds) like he gets really irritated by it.
DS2 however is 2.2 & is chatty & receptive and the difference in communication is highlighted somewhat.
Of course to some it might sound like he has something wrong with his hearing but I have done some rudimentary tests on him and his hearing seems fine to me.