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Two types of trees to handle adjunct relative clauses exist in the
XTAG grammar: one in which there is PPw substitution with
a null Comp built in and one in which there is a null NPw
built in and a Comp substitutes in. There is no NPw
substitution tree with a null Comp built in. This is because of
the contrast between ((263)) and ((264)).
- the day [[on whose predecessor] [C [Muriel left]]]
- *the day [[whose predecessor] [C [Muriel left]]]
In general, adjunct relatives are not possible with an overt NPw.
We do not consider ((265)) and ((266)) to be counterexamples to
the above statements because we consider where and when
to be exhaustive PPs that head a PP initial tree.
- the place [where [C [Muriel wrote her first book]]]
- the time [when [C [Muriel lived in Bryn Mawr]]]