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In linguistics and grammar, a sentence is a linguistic expression, such as the English example " The quick brown fox jumps over the lazy dog." In traditional grammar, it is typically defined as a string of words that expresses a complete thought, or as a unit consisting of a subject and
predicate Predicate or predication may refer to: * Predicate (grammar), in linguistics * Predication (philosophy) * several closely related uses in mathematics and formal logic: **Predicate (mathematical logic) **Propositional function **Finitary relation, o ...
. In non-functional linguistics it is typically defined as a maximal unit of syntactic structure such as a constituent. In
functional linguistics Functional linguistics is an approach to the study of language characterized by taking systematically into account the speaker's and the hearer's side, and the communicative needs of the speaker and of the given language community. Linguistic fun ...
, it is defined as a unit of written texts delimited by graphological features such as upper-case letters and markers such as periods, question marks, and exclamation marks. This notion contrasts with a curve, which is delimited by phonologic features such as pitch and loudness and markers such as pauses; and with a clause, which is a sequence of words that represents some process going on throughout time. A sentence can include words grouped meaningfully to express a statement, question, exclamation, request,
command Command may refer to: Computing * Command (computing), a statement in a computer language * COMMAND.COM, the default operating system shell and command-line interpreter for DOS * Command key, a modifier key on Apple Macintosh computer keyboards * ...
, or
suggestion Suggestion is the psychological process by which a person guides their own or another person's desired thoughts, feelings, and behaviors by presenting stimuli that may elicit them as reflexes instead of relying on conscious effort. Nineteenth-ce ...
.


Typical associates


Clauses

A sentence is typically associated with a clause and a clause can be either a ''clause simplex'' or a ''clause complex''. A clause is a clause simplex if it represents a single process going on through time, and it is a clause complex if it represents a logical relation between two or more processes and is thus composed of two or more clause simplexes. A clause (simplex) typically contains a predication structure with a subject noun phrase and a
finite verb Traditionally, a finite verb (from la, fīnītus, past participle of to put an end to, bound, limit) is the form "to which number and person appertain", in other words, those inflected for number and person. Verbs were originally said to be ''fin ...
. Although the subject is usually a noun phrase, other kinds of phrases (such as gerund phrases) work as well, and some languages allow subjects to be omitted. In the examples below, the subject of the outmost clause simplex is in italics and the subject of ''boiling'' is in square brackets. Notice that there is clause embedding in the second and third examples. : ''
ater Ater (Hebrew אֲתַר) is an Old Testament male name. #A descendant of Hezekiah, who returned from Babylon ; #An Israelite, who subscribed to Nehemiah Nehemiah is the central figure of the Book of Nehemiah, which describes his work in reb ...
' boils at 100 degrees Celsius. : ''It'' is quite interesting ''that
ater Ater (Hebrew אֲתַר) is an Old Testament male name. #A descendant of Hezekiah, who returned from Babylon ; #An Israelite, who subscribed to Nehemiah Nehemiah is the central figure of the Book of Nehemiah, which describes his work in reb ...
boils at 100 degrees Celsius''. : ''The fact that
ater Ater (Hebrew אֲתַר) is an Old Testament male name. #A descendant of Hezekiah, who returned from Babylon ; #An Israelite, who subscribed to Nehemiah Nehemiah is the central figure of the Book of Nehemiah, which describes his work in reb ...
boils at 100 degrees Celsius'' is quite interesting. There are two types of clauses: ''independent'' and ''non-independent''/''interdependent''. An independent clause realises a speech act such as a statement, a question, a command or an offer. A non-independent clause does not realise any act. A non-independent clause (simplex or complex) is usually logically related to other non-independent clauses. Together they usually constitute a single independent clause (complex). For that reason, non-independent clauses are also called ''interdependent''. For instance, the non-independent clause ''because I have no friends'' is related to the non-independent clause ''I don't go out'' in ''I don't go out, because I have no friends''. The whole clause complex is independent because it realises a statement. What is stated is the causal nexus between having no friend and not going out. When such a statement is acted out, the fact that the speaker doesn't go out is already established, therefore it cannot be stated. What is still open and under negotiation is the reason for that fact. The causal nexus is represented by the independent clause complex and not by the two interdependent clause simplexes. See also copula for the consequences of the verb ''to be'' on the theory of sentence structure.


Classification


By structure

One traditional scheme for classifying English sentences is by clause structure, the number and types of clauses in the sentence with finite verbs. * A ''simple sentence'' consists of a single
independent clause An independent clause (or main clause) is a clause that can stand by itself as a '' simple sentence''. An independent clause contains a subject and a predicate and makes sense by itself. Independent clauses can be joined by using a semicolon or ...
with no dependent clauses. * A ''compound sentence'' consists of multiple independent clauses with no dependent clauses. These clauses are joined together using conjunctions,
punctuation Punctuation (or sometimes interpunction) is the use of spacing, conventional signs (called punctuation marks), and certain typographical devices as aids to the understanding and correct reading of written text, whether read silently or aloud. An ...
, or both. * A ''complex sentence'' consists of one independent clause and at least one dependent clause. * A ''compound–complex sentence'' (or ''complex–compound sentence'') consists of multiple independent clauses, at least one of which has at least one dependent clause.


By function or speech act

Sentences can also be classified based on the
speech act In the philosophy of language and linguistics, speech act is something expressed by an individual that not only presents information but performs an action as well. For example, the phrase "I would like the kimchi; could you please pass it to me?" ...
which they perform. For instance, English sentence types can be described as follows: * A ''declarative sentence'' typically makes an ''assertion'' or ''statement'': "You are my friend." * An ''interrogative sentence'' typically raises a ''question'': "Are you my friend?" * An ''imperative sentence'' typically makes a ''command'': "Be my friend!" * An ''exclamative sentence'', sometimes called an ''exclamatory sentence'', typically expresses an ''exclamation'': "What a good friend you are!" The form (declarative, interrogative, imperative, or exclamative) and meaning (statement, question, command, or exclamation) of a sentence usually match, but not always. For instance, the interrogative sentence "Can you pass me the salt?" is not intended to express a question but rather to express a command. Likewise, the interrogative sentence "Can't you do anything right?" is not intended to express a question on the listener's ability, but rather to express a statement on the listener's lack of ability; see rhetorical question.


Major and minor sentences

A major sentence is a ''regular'' sentence; it has a subject and a
predicate Predicate or predication may refer to: * Predicate (grammar), in linguistics * Predication (philosophy) * several closely related uses in mathematics and formal logic: **Predicate (mathematical logic) **Propositional function **Finitary relation, o ...
, 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." Other examples of minor sentences are headings (e.g. the heading of this entry), stereotyped expressions ("Hello!"), emotional expressions ("Wow!"), proverbs, etc. These can also include nominal sentences like "The more, the merrier." These mostly omit a main verb for the sake of conciseness but may also do so in order to intensify the meaning around the nouns. Sentences that comprise a single word are called word sentences, and the words themselves
sentence word A sentence word (also called a one-word sentence) is a single word that forms a full sentence. Henry Sweet described sentence words as 'an area under one's control' and gave words such as "Come!", "John!", "Alas!", "Yes." and "No." as examples of ...
s.


Length

The 1980s saw a renewed surge in interest in sentence length, primarily in relation to "other syntactic phenomena". One definition of the average sentence length of a prose passage is the ratio of the number of words to the number of sentences. The textbook ''Mathematical linguistics'', by András Kornai, suggests that in "journalistic prose the median sentence length is above 15 words". The average length of a sentence generally serves as a measure of sentence difficulty or complexity. In general, as the average sentence length increases, the complexity of the sentences also increases. Another definition of "sentence length" is the number of clauses in the sentence, whereas the "clause length" is the number of
phones A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into ele ...
in the clause. Research by Erik Schils and Pieter de Haan by sampling five texts showed that two adjacent sentences are more likely to have similar lengths than two non-adjacent sentences, and almost certainly have a similar length when in a work of fiction. This countered the theory that "authors may aim at an alternation of long and short sentences". Sentence length, as well as word difficulty, are both factors in the readability of a sentence; however, other factors, such as the presence of conjunctions, have been said to "facilitate comprehension considerably".


See also

*
Clause In language, a clause is a constituent that comprises a semantic predicand (expressed or not) and a semantic predicate. A typical clause consists of a subject and a syntactic predicate, the latter typically a verb phrase composed of a verb w ...
* Constituent *
Discourse Discourse is a generalization of the notion of a conversation to any form of communication. Discourse is a major topic in social theory, with work spanning fields such as sociology, anthropology, continental philosophy, and discourse analysis. ...
*
Periodic sentence A periodic sentence is a sentence with a stylistic device featuring syntactical subordination to a single main idea, which usually is not complete until the very end of the sentence. The periodic sentence emphasizes its main idea by placing it at ...
* Sentence arrangement *
Sentence function In linguistics, a sentence function refers to a speaker's purpose in uttering a specific sentence, phrase, or clause. Whether a listener is present or not is sometimes irrelevant. It answers the question: "Why has this been said?" The four basic se ...
* Syntax *
T-unit In linguistics, the term T-unit was coined by Kellogg Hunt in 1965. It is defined as the "shortest grammatically allowable sentences into which (writing can be split) or minimally terminable unit." Often, but not always, a T-unit is a sentence. ...
* Utterance


References

{{Authority control Semantic units Statements Syntactic entities