“…Children's typical overgeneralizations of grammatical morphemes and word meanings (e.g., how did you unsqueezed it, I beed a good typewriter, let's get brooming, these fl owers are sneezing me ; Stilwell-Peccei, 2006 ) are evidence for how they have perceived regularities in the language they encounter before they have had enough experience to mark the restrictions of their use. Knowledge rooted thus in experience results in the child acquiring not just the meaning of a word, its pronunciation, its grammatical role, and its morphology but also a detailed and networked memory of its commonly associated grammatical and semantic structures, or what Cook ( 1997 ) has described as the accretion of its individual idiosyncrasies (see Hoey, 2005 , for a similar argument). It is this accretion of knowledge about how words are conventionally sequenced that explains synchronic and diachronic dialect variation across communities and why native speakers today could, and yet do not, produce grammatical but nonnativelike selections such as She kicked the ball strongly .…”