Sentence (linguistics)
A linguistic unit expressing a thought or speech act.
In linguistics and grammar, a sentence is a linguistic expression, such as the English example 'The quick brown fox jumps over the lazy dog' (a pangram). In traditional grammar, it is typically defined as a string of words that expresses a thought, or as a unit consisting of a subject and predicate. In non-functional linguistics it is typically defined as a maximal unit of syntactic structure such as a constituent. In functional linguistics, 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.
- field
- Linguistics and grammar
- known_for
- Definition and classification of sentences by structure and function
Lore & Background
A sentence can include words grouped meaningfully to express a statement, question, exclamation, request, command, or suggestion. It is typically associated with a clause, which can be a clause simplex (representing a single process going on through time) or a clause complex (representing a logical relation between two or more processes). A clause simplex contains a predication structure with a subject noun phrase and a finite verb, though some languages allow subjects to be omitted. Sentences are classified by structure into simple (single independent clause), compound (multiple independent clauses), complex (one independent and at least one dependent clause), and compound–complex (multiple independent clauses, at least one with a dependent clause). They are also classified by function or speech act: declarative (statement), interrogative (question), imperative (command), and exclamative (exclamation). The form and meaning of a sentence usually match, but not always, as in rhetorical questions. Major sentences have a subject and predicate, while minor sentences are irregular and lack a main clause, such as headings, stereotyped expressions, emotional expressions, and proverbs. Sentence length, measured by word count or clause count, affects readability and complexity; research suggests adjacent sentences tend to have similar lengths, especially in fiction.
Reader's Guide
The concept of a sentence is foundational to linguistics and grammar, serving as a key unit for analyzing written and spoken language. Its definitions vary across linguistic frameworks: traditional grammar emphasizes subject-predicate structure, non-functional linguistics focuses on syntactic maximality, and functional linguistics relies on graphological markers. This diversity reflects ongoing theoretical debates about the nature of linguistic units. Classification by structure (simple, compound, complex, compound–complex) and by speech act (declarative, interrogative, imperative, exclamative) provides a systematic way to describe sentence types. The distinction between major and minor sentences highlights that not all utterances conform to canonical subject-predicate form. Sentence length, as a measure of complexity, influences readability and has been studied in relation to prose style and comprehension. The entry underscores that sentences are not merely formal units but also carriers of meaning and communicative intent, with occasional mismatches between form and function (e.g., interrogatives used as commands).
Did You Know?
- A sentence can be classified as a simple, compound, complex, or compound–complex sentence based on clause structure.
- A minor sentence is an irregular type that does not contain a main clause, such as 'Mary!' or 'Precisely so.'
- The average sentence length of a prose passage is defined as the ratio of the number of words to the number of sentences.
- Research by Erik Schils and Pieter de Haan showed that two adjacent sentences are more likely to have similar lengths than two non-adjacent sentences.
Frequently Asked Questions
What is a Sentence in linguistics?
A sentence is a linguistic expression that conveys a thought or performs a speech act. In everyday English, a familiar example is the pangram 'The quick brown fox jumps over the lazy dog.' It sits at the core of how we organize and communicate meaning through language.
How do traditional and functional grammars define a Sentence differently?
Traditional grammar typically treats a sentence as a string of words expressing a thought, often structured around a subject and a predicate. Functional linguistics, by contrast, defines it as a unit of written text bounded by graphological cues like capitalization and terminal punctuation such as periods or question marks.
What role does a Sentence play in syntactic analysis?
In non-functional (formal) linguistics, a sentence is treated as a maximal unit of syntactic structure, essentially the largest well-formed constituent in a given system. This makes it the primary object of study for parsing and tree-diagramming exercises.
Why is the Sentence concept central to the field of linguistics and grammar?
It serves as the foundational building block for both structural description and functional interpretation of language. Nearly every subfield—syntax, semantics, pragmatics, and discourse analysis—relies on the sentence as its basic unit of classification and analysis.
What features distinguish a Sentence in written text from a clause or phrase?
In written form, a sentence is set apart by graphological markers: an initial capital letter and a closing punctuation mark like a period, question mark, or exclamation point. These visual delimiters let readers identify the boundaries of a complete thought, unlike a clause or phrase that lacks such terminal cues.
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