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Adjunction on PRO, which would yield the ungrammatical ((262)) is blocked.
(261)0(261
- (262)
- *I want [[PRO [who Muriel likes] to read a book]].
This is done by specifying the <case> feature of NPf to be
nom/acc. The <case> feature of PRO is null. This
leads to a feature clash and blocks adjunction of relative clauses on to
PRO.
XTAG Project
http://www.cis.upenn.edu/~xtag