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Prepositions
There are three basic types of prepositional phrases, and three places
at which they can adjoin. The three types of prepositional phrases
are: Preposition with NP Complement, Preposition with Sentential
Complement, and Exhaustive Preposition. The three places are to the
right of an NP, to the right of a VP, and to the left of an S. Each
of the three types of PP can adjoin at each of these three places, for
a total of nine PP modifier trees. Table 19.1 gives the
tree family names for the various combinations of type and
location. (See Section 23.4.2 for discussion of the
spuPnx, which handles post-sentential comma-separated PPs.)
Table 19.1:
Preposition Anchored Modifiers
|
position and category modified |
|
pre-sentential |
post-NP |
post-VP |
Complement type |
S modifier |
NP modifier |
VP modifier |
S-complement |
Pss |
nxPs |
vxPs |
NP-complement |
Pnxs |
nxPnx |
vxPnx |
no complement |
Ps |
nxP |
vxP |
(exhaustive) |
|
|
|
|
The subset of preposition anchored modifier trees in Figure 19.9
illustrates the locations and the four PP types. Example sentences using the
trees in Figure 19.9 are shown in ((303))-((306)). There are also
more trees with multi-word prepositions as anchors. Examples of these are:
ahead of, contrary to, at variance with and as recently as.
Figure:
Selected Prepositional Phrase Modifier trees: Pss, nxPnx, vxP and vxPPnx
|
(302)0(302
- (303)
- [PP with Clove healthy PP], the veterinarian's bill will be more affordable . (Pss19.4)
(303)0(303
- (304)
- The frisbee [PP in the brambles PP] was hidden . (nxPnx)
(304)0(304
- (305)
- Clove played frisbee [PP outside PP] . (vxP)
(305)0(305
- (306)
- Clove played frisbee [PP outside of the house PP] . (vxPPnx)
Prepositions that take NP complements assign accusative case to those
complements (see section 4.4.3.1 for details). Most prepositions take
NP complements. Subordinating conjunctions are analyzed in XTAG as Preps
(see Section 15 for details). Additionally, a few non-conjunction
prepositions take S complements (see Section 8.8 for details).
Next: Adverbs
Up: Modifiers
Previous: Time Noun Phrases
XTAG Project
1998-09-14