If your grey is right at 1 year old, it may be too soon for him to talk, some don't talk until later, but just talk to him in a normal voice, have conversations with him and eventually he will start to talk. Usually they start out with jibberish, no discernable words and then they get plainer in the speech. And a few greys won't ever talk, but most do so more than likely yours will too.
Just be careful of what you do say, never use words you don't want repeated and be prepared for them to mimic other sounds in the home, like the phone ringing, microwave bleeping or maybe your laugh. Josey mimics my laugh and it is funny to hear it from her beak, sounds just like me, only better.:laugh: