Generally speaking,grammaticalization is the abstraction of lexical items or constructions which have developed into the minimal grammatical units in a certain context.As a universal linguistic phenomenon,grammaticalization has attracted the attention of eastern and western scholars for a long time.However,it hadn't become a hot topic in the study of language until the beginning of the 1970s.It is widely agreed that a typical grammaticalization involves change at various levels,such as,phonemic,semantic/ pragmatic and morphosyntactic levels.In this paper we tend to study grammaticalization from the functional perspective and take semantic/functional change involved in it as our focus in order to deepen our understanding of grammaticalization phenomena.
