Partition by Exhaustification and Polar Questions in Vietnamese

This note presents a series of contrasts pertaining to Vietnamese polar questions: (i) The subject can be definite but not quantificational; (ii) the subject can be plain but not only-focused; (iii) the modal adverb chắc chắn (‘certainly’) can follow but not precede verum focus. I argue that a monoclausal analysis, advocated in several previous works, will have difficulties accounting for these contrasts and propose a bi-clausal analysis that explains them in a natural way. The explanation relies on the assumption of a general condition on questions, Partition by Exhaustification (PbE), in conjunction with some other independently motivated semantic and pragmatic constraints.