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Grammar

The subfields of grammar are phonetics, phonology, morphology, syntax, and semantics.

Linguists recognise a number of types of grammar.

• Prescriptive grammar -- an attempt to tell the users of the language how to use it in order to speak correctly. This is the sense in which some people state that "I didn't do nothing" is bad grammar.
• Descriptive grammar -- an attempt to describe the language as it is being used, regardless of whether it is considered correct or not. In many dialects, people say "I didn't do nothing"; a descriptive grammar of such dialects would accordingly treat that sentence as grammatical and provide rules that account for it. Likewise a descriptive grammar of formal English would provide rules accounting for "I didn't do anything."
• Teaching grammar -- a combination of prescriptive and descriptive approaches with the aim of teaching a language to children and foreigners. In teaching grammars it is often necessary to simplify in order to achieve success, as neither the prescriptive nor the descriptive approaches are logical or easy to understand in all details.
• Generative grammar -- A technical linguistic term. A generative grammar for a particular language specifies, for each string of words, whether or not that string constitutes a grammatical sentence in that language. It does not provide a set of rules for constructing or parsing sentences.

Grammars evolve through usage and human population separations. With the advent of written representations, formal rules about language usage tend to appear also. Formal grammars are codifications of usage that are developed by observation. As the rules become established and developed, the prescriptive concept of grammatical correctness can arise. This often creates a gulf between contemporary usage and that which is accepted as correct. Linguists normally consider that prescriptive grammars do not have any justification beyond their authors' aesthetic tastes. However, prescriptions are considered in sociolinguistics as part of the explanation for why some people say "I didn't do nothing", some say "I didn't do anything", and some say one or the other depending on social context.

The formal study of grammar is an important part of education from a young age through advanced learning, though the rules taught in schools are not a "grammar" in the sense most linguists use the term, as they are often prescriptive rather than descriptive.

Planned languages are more common in the modern day. Many have been designed to aid human communication (such as Esperanto or the intercultural, highly logic-compatible artificial language Lojban) or created as part of a work of Fiction (such as the Klingon language and Elvish language). Each of these artificial languages has its own grammar.

Programming languages used for the purpose of computer programming (such as Java) have grammars, but do not resemble human languages very much. These are called formal grammars. In particular, they conform precisely to a grammar generated by a pushdown automaton with arbitrarily complex commands. They usually lack questions, exclamations, simile, metaphor and other features of human languages.

It is a myth that analytic languages have simpler grammar than synthetic languages. That languages have different levels of grammatical complexity can be shown to be false by realizing the fact that changes to words are not the only kind of grammar. Chinese is very context dependent. In other words, context accomplishes the same role as declension and conjugation. (Chinese does have some inflections, and had more in the past.) Latin, which is synthetic, uses affixes and inflections to accomplish the same role that Chinese does with syntax. Because Latin words are quite (though not completely) self-contained, a sentence can be made from scattered elements. In short, Latin has a complex affixion and a simple syntax, while Chinese has the opposite.

Grammars of specific languages

• Arabic grammar
• Chinese grammar
• Dutch grammar
• English grammar
• Esperanto grammar
• Finnish language grammar
• French grammar
• German grammar
• Hebrew grammar
• Italian grammar
• Japanese grammar
• Latin grammar
• Russian grammar
• Slovene grammar
• Spanish grammar
• Swedish grammar

• adjective
• adjunct
• adverb
• article
• aspect
• auxiliary verb
• case
• clause
• closed class word
• comparative
• complement
• compound noun and adjective
• conjugation
• dangling modifier
• declension
• dual (form for two)
• expletive
• function word
• gender
• infinitive
• measure word (classifier)
• modal particle
• movement paradox
• modifier
• mood
• noun
• number
• object
• open class word
• parasitic gap
• part of speech
• particle
• person
• phrase
• phrasal verb
• plural
• predicate (also verb phrase)
• preposition
• pronoun
• pseudo-Anglicism
• sandhi
• singular
• subject
• superlative
• tense
• uninflected word
• verb
• voice

• Affixion
• Alternation
• Reduplication
• Word Order

• Analytic language vs. Synthetic language
• Disputed English grammar
• Functional grammar
• Generalised Phrase Structure Grammar (GPSG)
• Government and Binding
• Head-Driven Phrase Structure Grammar (HPSG)
• Lexical Functional Grammar (LFG)
• List of -onyms
• List of frequently misused English words
• Minimalist Program
• Phrase structure rules
• Principles and Parameters
• Role and reference grammar
• Syntax
• Systemic functional grammar
• Transformational-generative grammar
• Tree adjoining grammar (TAG)
• Word grammar
• Ambiguous grammar

In computer science, the syntax of each programming language is defined by a formal grammar. In theoretical computer science and mathematics, formal grammars define formal languages. The Chomsky hierarchy defines several important classes of formal grammars.

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