What is phrase structure trees?
Phrase structure trees (PS trees, for short) are explicit graphic representations of a speaker’s knowledge of the structure of the sentences of his language.
What is the syntactic unit in a phrase structure tree?
A syntactic category is a syntactic unit that theories of syntax assume. Word classes, largely corresponding to traditional parts of speech (e.g. noun, verb, preposition, etc.) are syntactic categories. In phrase structure grammars, the phrasal categories (e.g. noun phrase, verb phrase, prepositional phrase, etc.)
What is a phrase structure tree diagram?
A tree diagram with syntactic category information is called a phrase struc ture tree or a constituent structure tree. This tree shows that a sentence is both a linear string of words and a hierarchical structure with phrases nested in phrases.
What is the relationship between phrase structure rules and phrase structure trees?
The categories that occur to the left of the arrow in a phrase structure rule are called phrasal categories; categories that never occur on the left side of any rule are lexical categories. Phrase structure trees always have lexical categories ta the bottom since the rules must apply until no phrasal categories remain.
What is a syntactic unit?
Definition: SyntacticUnit (also called constituent) is a ‘term in grammatical analysis for a linguistic unit which is a functional component of a larger construction.
What is Grammaticality not based on?
A linguistic ‘string’ that follows a set of given rules, A grammatical utterance that is not necessarily meaningful, Based on a native speaker’s competence or knowledge of a language, Defined by the possible outputs a particular grammar can generate.
What are transformational rules?
Transformational rule is a rule that transforms syntactic structure. Deletion, Insertion, and movement are instances of transformational rules. S-structure is derived from d-structure by means of transformations, and Logical Form is derived from S-structure in a similar way.
What are the rewrite rules in phrase structure grammar?
The rule expresses an instruction to replace A by X. For example, a sentence (S) can be rewritten as a noun phrase (NP) plus a verb phrase (VP): S → NP + VP; and the verb phrase can be rewritten as a verb (V) plus a noun phrase (NP): VP → V + NP. Also called a phrase-structure rule.