This paper aims to study a syntactic change of
not in the history of English. It is argued that
not and its variants were generated in [Spec, NegP] as XP categories in OE and ME, but they began to be reanalyzed as Neg
0 in the sixteenth century. Noting that the OE and ME negative marker
ne in Neg
0 was missing in some cases, I assume [
Neg e] for Neg
0 without
ne, and propose a licensing condition on [
Neg e]. Then I claim that the condition, which was satisfied in OE and ME, began to be violated in the sixteenth century, and
not came to fill in [
Neg e] to avoid the violation.
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