Infants and very young children develop almost miraculously the ability of speech, without apparent effort, without even being taught - as opposed to the teenager or the adult struggling without, it seems, ever being able to reach the same level of proficiency as five year olds in their first langua[...]
Offers a theory of diachronic change based on studies of language acquisition. This title addresses diachronic change of languages in terms of a restructuring of speakers' internal grammatical knowledge.[...]