I thought to read on matrix clauses. In
25) [Bill wants [Susan to leave]].
I think in text this seemed like a matrix clause. Matrix clauses get called that in that they contain two clauses? I may not get where these clauses get placed. I think a clause requests a verb and arguments. I may get Bill wants Susan to leave, one clause, Bill (subject[?], wants (transitive[?] verb[?]), Susan (object[?]), to leave, (I may not get). I may not get where a second clause seems here?