This paper presents a new analysis of complementizer deletion phenomena, focusing in particular on
that-deletion in English. More specifically, I propose that in English, when a certain specific mood is projected up onto CP,
that-deletion is disallowed, and vice versa. It is argued extensively that despite some differences in the way mood-marking is coded, the same analysis also holds for other languages. In addition, assuming that the definition of mood can be extended to the domain of intersentences, a certain specific mood is involved in the unavailability of complementizer deletion in constructions with factive, response-stance, and manner-of-speaking verbs.
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