The particular Dutch construction can be generated by a context-free grammar that produces the correct sentences as strings of symbols. The problem is that the parse trees produced by such a grammar violate the intuition of speakers about the phrase structure of these Dutch sentences. In other ...
If all but a very small and marginal fraction of natural language is context-free, then the context-free grammar model has succeeded as well as we normally expect scientific theory to succeeded in modeling data. In our opinion, the Pullum and Gazdar paper may not be as ironclad as they ...