This paper presents one more case to show that some constituents play a special information role in sentences.The paper first analyzes the information structure of Ta sanshi nian lai yizhi zhu zai Wuhu and Ta zai Wuhu yizhi zhu le sanshi nian,point-ing out that it is the special information function of yizhi,Xperiod lai and Xperiod that deter-mines the focus-end of the two sentences.On this basis,the paper argues that the Restric-tion of Compatibility of Focus Structures has power in guiding sentence composition and can thus enter the system of grammar.
focus-endpredicate focusinformation structureXperiod lai(来)yizhi(一直)Restriction of Compatibility of Focus Structures
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