This chapter extends the analysis proposed in Chapter 7 to Gungbe topic constructions and yes-no questions. It is argued that the sentence-final low tone is the reflex of a ‘quasi-null’ morpheme that functions as yes-no question marker (QM). This QM heads an interrogative projection InterP that projects within the C-system and whose specifier hosts the clause. In this context, the QM has scope over the whole clause, which is interpreted as a yes-no question.
Keywords: Gungbe topic constructions, yes-no questions, C-system, clause, yes-no question marker