answer to elaine: why the P stranding penalty?
It shows that extracting the complement of a noun is not the same as extracting the complement of a preposition.
One (syntactic) way to go would be to say that the ’subject island’ is ‘selective’ and allows PP but not NP to be ‘moved’.
This is unlikely given the acceptability of NP extraction out of infinitival or gerund subjects:
In his bedroom, w...