In the paper the causal clauses introduced by ＂nanguai （难怪）＂ in Mandarin are discussed in the following four aspects： 1） The structural semantic type. There are three different types of causal clauses introduced by ＂nanguai （难怪）＂ according to the types of the mark, namely independent, imbedded, and multiple. 2） The degree of stereotype of the causal clauses introduced by ＂nanguai （难怪）＂. 3） The constructional semantic features of the causal clauses introduced by ＂nanguai （难怪）＂. This type of clauses expresses the meani...
