In this paper I shall argue that
not is neither a head nor a specifier of any maximal projection, but an adverbial modifier adjoining to I directly. The paper pursues this thesis from several pointsof view (VP ellipsis, HMC, I-to-C movement, and the strict adjacency of
not to
do/to), before briefly examining the historical changes of
not. The examined data include negative subjunctive
that-clauses (Section 2)and some archaic negative sentences (Section 3). By comparing various analyses of
not and looking into the history of English negation, this paper defends the adverbial status of
not in I against the dominant NegP hypothesis with not in its head. With a certain strategy, this status of adjoining not does not conflict with Potsdam's (1997) argument for VP ellipsis. Furthermore, Jespersen's (1917)historical cycle of negation can be naturally captured in the NegP-less clausal structure.
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