Focusing on two symmetric merges, namely {XP, YP} and {X, Y}, mainly related to there constructions, the paper discusses Moro s (1997) and Yang s (1999) approaches and the problems raised in them, and presents the solutions based on Chomsky s (2013) label theory. The paper shows that the movement of a syntactic object successfully solves the linearization and label problem yielded by the non-head symmetry of {XP, YP} but cannot those yielded by the head symmetry of {X, Y}. It will be argued that the head symmetry raised in {X, Y} can be accounted for by adopting Boeckx s (2008) Vector Merge, non-movement approach, which provides a point of origin and a point of end in Merge.
1. Introduction
2. Two Symmetries
3. Linearization and Labeling
4. Concluding Remarks
References
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