Abstract This chapter provides evidence that there are two complementizer-type positions in English, each of which is the head of a maximal projection. The two heads, C and Pol, permit the explanation of a range of phenomena that do not appear to be amenable to a one-complementizer analysis. This C/Pol analysis captures some facts about the behaviour of why and how come as well as some subtle differences between them. The chapter also proposes that PolP can appear not only as a complement of C, but as a complement of I.
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