@@ Causative construction is among the basic categories in natural language. There are all together three types of causative constructions: lexical causatives, morphological causatives, and periphrastic causatives. In the first category, the causative situation is realized as an atomic unit, for example, the verb 殺 ‘to kill’ in兩臣殺二君 is a lexical causative verb; while in the second, causative situation is realized by morphological means, as in修身正行，不能来福, lài来‘encourage to come’marked by a different pronunciation is a causative variant of the verb lai来 rather than non-causative variant pronounced as lái 来‘to come’. The third, periphrastic causatives express a causative situation analytically by adding a causative verb such as 令,命,使‘to order’, just like‘get’, ‘make’, ‘have’ in English.