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Sic may show that an uncommon or archaic expression is reported faithfully, [12] such as when quoting the U.S. Constitution: "The House of Representatives shall chuse [sic] their Speaker ..." However, several writing guidebooks discourage its use with regard to dialect, such as in cases of American and British English spelling differences .
Phrase structure rules as they are commonly employed result in a view of sentence structure that is constituency-based. Thus, grammars that employ phrase structure rules are constituency grammars (= phrase structure grammars), as opposed to dependency grammars, [4] which view sentence structure as dependency-based. What this means is that for ...
A phrase typically serves the same function as a word from some particular word class. [3] For example, my very good friend Peter is a phrase that can be used in a sentence as if it were a noun, and is therefore called a noun phrase.
A major sentence is a regular sentence; it has a subject and a predicate, e.g. "I have a ball." In this sentence, one can change the persons, e.g. "We have a ball." However, a minor sentence is an irregular type of sentence that does not contain a main clause, e.g. "Mary!", "Precisely so.", "Next Tuesday evening after it gets dark."
The term phrase structure grammar was originally introduced by Noam Chomsky as the term for grammar studied previously by Emil Post and Axel Thue (Post canonical systems). Some authors, however, reserve the term for more restricted grammars in the Chomsky hierarchy : context-sensitive grammars or context-free grammars .
A sentence consisting of at least one dependent clause and at least two independent clauses may be called a complex-compound sentence or compound-complex sentence. Sentence 1 is an example of a simple sentence. Sentence 2 is compound because "so" is considered a coordinating conjunction in English, and sentence 3 is complex.
Syntactic theories based on phrase structure typically analyze subject–aux inversion using syntactic movement. In such theories, a sentence with subject–aux inversion has an underlying structure where the auxiliary is embedded deeper in the structure. When the movement rule applies, it moves the auxiliary to the beginning of the sentence. [5]
However, because phrase structure trees and structurally simpler trees are always able to derive one another from each other and are both still used today, ICA is still relevant in many contemporary theories. An important aspect of ICA in phrase structure grammars is that each individual word is a constituent by definition.