remove constraint about complement having to have subcat=(). as a counter-example "pp -> 'a' + 'vendere la casa'": "vendere la casa" is a complement but it has one argument for which it subcategorizes (that is, its subject).
got prepositional phrases and adverbial vps working "fare bene a vendere la casa (to do well to sell the house)"
restrict adverbial verbs to only "fare", for now