Prof Caroline Heycock explains how phrase structure can be generalised through the X-bar schema.
The class numbers follow the chapter numbers of the free online textbook “Syntax of Natural Language” by Santorini and Kroch at http://www.ling.upenn.edu/~beatrice/syntax-textbook/.
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http://creativecommons.org/licenses/by-nc-sa/3.0/
Linguistics at the University of Edinburgh