A constraint on preposition sequences in English complex predicates

This paper makes two main arguments. First, I show that certain V + P + P constructions with a verb and two intransitive prepositions are constituents involving a sequence of verb and two small clauses that together constitute a complex predicate. Second, after noting that the first P is restricted to the preposition back, I then argue that this restriction stems from backʹs unaccusative status that allows adjunction of the second PP to backʹs internal argument position. A preposition like through does not permit such an adjunction because its sister position, if phonetically expressed, must be an object DP.