| 21. | The basic difficulty is suggested by the following trees representing the phrase structures of the sentences:
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| 22. | And in the 30 variations that follow, this phrase structure, with repetitions, is maintained.
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| 23. | The same distinction is illustrated next using constituency-based trees ( of phrase structure grammars ):
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| 24. | The syntax of expressions in C and C + + is specified by a phrase structure grammar.
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| 25. | Most of the syntactic innovations of GPSG were subsequently incorporated into head-driven phrase structure grammar.
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| 26. | Both phrase structure grammars and DGs do, however, see non-finite VPs as constituents.
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| 27. | It is a phrase structure account that relies on unseen movement / copying mechanisms below the surface.
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| 28. | Phrase markers are generated by applying phrase structure rules, and themselves are subject to further transformational rules.
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| 29. | The phrase structure rules of context free grammar, for instance, were generating sentence structure top down.
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| 30. | He was also involved with work on generalized phrase structure grammar, HPSG's immediate intellectual predecessor.
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