ABSTRACT
This chapter discusses wùbì. Wùbì is interchangeable with yídìng in certain cases, but not in others. It is not interchangeable with the other yídìng family members. I argue for the following two points concerning wùbì. First, it expresses strong deontic necessity only. It does not express intensification or epistemic necessity. To put it differently, wùbì is not semantically underspecified. Second, it is interchangeable with yídìng only when the sentence receives an imperative reading. But, wùbì is semantically different from yídìng in imperative sentences in that wùbì expresses an intensified addressee’s To-Do List, that is, an intensified deontic ordering, whereas yídìng does not denote an intensified deontic ordering, but simply intensification.
