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Thetical Grammar forms one of the two domains of Discourse Grammar, the other domain being Sentence Grammar. The building blocks of Thetical Grammar are theticals, that is, linguistic expressions which are interpolated in, or juxtaposed to, clauses or sentences but syntactically, semantically and, typically, prosodically independent from theses structures. The two domains are associated with contrasting principles of designing texts: Whereas Sentence Grammar is essentially restricted to the structure of sentences in a propositional format, Thetical Grammar concerns the overall contours of discourse beyond the sentence, thereby being responsible for a higher level of discourse production.〔〔 ==An example== The following example, taken from the ''Comprehensive Grammar of English'',〔 may illustrate the main characteristics of Thetical Grammar. *a. They considered Miss Hartley a very good teacher. *b. They considered Miss Hartley, a very good teacher. The phrase ''a very good teacher'' is a complement of the sentence in (a.), that is, it is part of the syntax of the sentence; in the framework of Discourse Grammar, it is therefore classified as belonging to Sentence Grammar. In (b.), by contrast, the same phrase (but printed in bold) is not part of the syntax, it is syntactically independent from the rest of the sentence, commonly classified as a non-restrictive appositive. And it is also different in other ways: Whereas in (a.) it is part of the prosody of the sentence, in (b) it is separated from the preceding clause by a tone unit boundary in spoken English and by a comma in written English. And third, there is also a difference in meaning: Whereas the meaning of ''a very good teacher'' in (a.) is determined by its syntactic function as a complement of the sentence, it is fairly independent from the sentence meaning in (b.); the former meaning has therefore been called restrictive and the latter non-restrictive.〔 The phrase ''a very good teacher'' in (b) is classified as belonging to Thetical Grammar, that is, as a thetical. Theticals are defined in the following way: (1) They are syntactically unattached, (2) they are typically set off prosodically from the rest of the utterance, (3) their meaning is non-restrictive, (4) they tend to be positionally mobile, and (5) their internal structure is built on principles of Sentence Grammar but can be elliptic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thetical Grammar」の詳細全文を読む スポンサード リンク
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