africa americas applicative universal grammar argument auxiliary verb bayesian inference charles darwin child development color creole creole language daniel everett dependent clause edward sapir endolinguistics explanandum generative grammar geoffrey sampson grammar grammatical aspect grammatical mood grammatical tense human brain indigenous australian languages instinct intonation language language acquisition language acquisition device language bioprogram theory linguistics linguistics wars noam chomsky origin of language papuan languages philosophical language pidgin portable document format postmodernism in language poverty of the stimulus principles and parameters psychological nativism recursion richard montague roger bacon spanish language universal networking language x-bar theory