Wh-moved PP

Like NP complements, PP complements can be extracted to form wh-questions, as in sentence ((152)).

(151)0(151

(152)

[To which dog]_i did Beth Ann throw the frisbee $\epsilon_{i}$? 

As can be seen in the tree in Figure 13.5, extraction of PP complements is very similar to extraction of NP complements from the same positions.

   

Figure: Ditransitive with PP with PP extraction tree: $\alpha$pW2nx0Vnx1pnx2

The PP extraction trees differ from NP extraction trees in having a PP rather than an NP left daughter node under S_q and in having the $\epsilon$ fill a PP rather than an NP position in the VP. In other respects these PP extraction structures behave like the NP extractions, including being used for topicalization.