Phase 1 Nonexistence: A single word utterance pointing out the "nonexistence" or disappearance of something.  That is, something was there and now it isn't

Utterance Context Explanation
allgone after the child has finished drinking all of her juice  
no more after the child has finished eating all of her cookies Even though no more is technically two words, many children use them as one unit, which is referred to as unanalyzed
bye-bye In response to "Where's Daddy?" Hopefully, you get the point