00556pamaa2200181 4500 0000023158 20060705090000.0 0631210601 401.93 LIG P142 LIG 1998 LIGHTFOOT The development of language : Acquisition, change, and evolution David Lightfoot. Oxford: Blackwell Publishers, 1998. 287p.; 23cm. Linguistic change Grammar, Comarative and general Language and languages -- Origin Language acquisition