The Adjunct Island Effect (AIE) is often attributed to something like an Adjunct Island Condition, stating that adjuncts are islands for extraction. I argue instead that the AIE is a property of the internal structure of certain PPs (regardless of their status as "arguments" or "adjuncts"). There are three parts to my argumentation. First, I show that simple PPs (i.e. those with a non-clausal, NP complement) are normally not islands, including both "argument" and "adjunct" PPs. Second, I show that tensed clausal PP "adjuncts," which often are islands, remain islands even when recast as "arguments." Third, I show that the same holds for gerundive PPs; these tend to be weak islands, but this property characterizes gerundive PP "adjuncts" and gerundive PP "arguments" alike. I conclude that the AIE is the result of the internal structure of PP, rather than being a result of the PP’s external syntax (i.e. whether it is an "argument" vs. an "adjunct").
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