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“(是)+NP+VP的”和“VP的+是+NP”在话语功能上的差异源自NP的指称性质的差异:“(是)+NP+VP的”中的NP为对比焦点,是上文已经引入的信息;而“VP的+是+NP”中的NP为常规焦点,是为下文引入新的事件角色。二者话语功能的差异可以从这两个句式信息结构和主位结构的组配上得到解释。
Differences in the functionalities of the words stem from the denotation of the alleged nature of NPs: “(yes) +” NP + VP “and ” VP + + + NP The NP in the comparison is the focus already introduced above, and the NP in VP + + NP is the normal focus for the introduction of new event roles below. The difference of the two discourse functions can be explained by the composition of the two sentence-type information structures and the thematic structure.