| http://www.w3.org/ns/prov#value | - But while traces are vital to the statement of many syntactic rules and regularities, they are ???empty categories??? ??? they are not audible in the sentence as spoken. (See Chomsky 1981 and Lasnik and Uriagereka 1986 for more on traces and other empty categories.) Traces (and other similarly abstract properties of languages) thus raise a question for the theory of language acquisition.
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