In linguistics, word order (also known as linear order) is the order of the syntactic constituents of a language. Word order typology studies it from a cross-linguistic perspective, and examines how languages employ different orders. Correlations between orders found in different syntactic sub-domains are also of interest.
Order types The primary word orders that are of interest are
the constituent order of a clause, namely the relative order of subject, object, and verb; the order of modifiers (adjectives, numerals, demonstratives, possessives, and adjuncts) in a noun phrase; the order of adverbials. Some languages use relatively fixed word order, often relying on the order of constituents to convey grammatical information. Other languages—often those that convey grammatical information through inflection—allow more flexible word order, which can be used to encode pragmatic information, such as topicalisation or focus. However, even languages with flexible word order have a preferred or basic word order, with other word orders considered "marked". Constituent word order is defined in terms of a finite verb (V) in combination with two arguments, namely the subject (S), and object (O). Subject and object are here understood to be nouns, since pronouns often tend to display different word order properties. Thus, a transitive sentence has six logically possible basic word orders:
about 45% of the world's languages deploy subject–object–verb order (SOV); about 42% of the world's languages deploy subject–verb–object order (SVO); a smaller fraction of languages deploy verb–subject–object (VSO) order; the remaining three arrangements are rarer: verb–object–subject (VOS) is slightly more common than object–verb–subject (OVS), and object–subject–verb (OSV) is the rarest by a significant margin.
Constituent word orders These are all possible word orders for the subject, object, and verb in the order of most common to rarest (the examples use "she" as the subject, "loves" as the verb, and "him" as the object):
SOV is the order used by the largest number of distinct languages; languages using it include Japanese, Korean, Mongolian, Turkish, the Indo-Aryan languages and the Dravidian languages. Some, like Persian, Latin and Quechua, have SOV (Subject-Object-Verb) normal word order but conform less to the general tendencies of other such languages. A sentence glossing as "She him loves" would be grammatically correct in these languages. SVO languages include Arabic (dialects), English, Spanish, Portuguese, Bulgarian, Macedonian, Serbo-Croatian, the Chinese languages and Swahili, among others. "She loves him." VSO languages include Ancient Egyptian, Biblical Hebrew, Classical Arabic, the Insular Celtic languages, Mayan, and the Philippine languages. "Loves she him." VOS languages include Fijian and Malagasy. "Loves him she." OVS languages include Hixkaryana. "Him loves she." OSV languages include Xavante and Warao. "Him she loves." Sometimes patterns are more complex: some Germanic languages, like German and Dutch, have SOV (Subject-object-verb) in subordinate clauses, but V2 word order in main clauses, SVO word order being the most common. Using the guidelines above, the unmarked word order is then SVO. Many synthetic languages such as Arabic, Latin, Greek, Persian, Romanian, Assyrian, Assamese, Russian, Turkish, Korean, Japanese, Finnish, and Basque have no strict word order; rather, the sentence structure is highly flexible and reflects the pragmatics of the utterance. However, also in languages of this kind there is usually a pragmatically neutral constituent order that is most commonly encountered in each language. Topic-prominent languages organize sentences to emphasize their topic–comment structure. Nonetheless, there is often a preferred order; in Latin and Turkish, SOV is the most frequent outside of poetry, and in Finnish SVO is both the most frequent and obligatory when case marking fails to disambiguate argument roles. Just as languages may have different word orders in different contexts, so may they have both fixed and free word orders. For example, Russian has a relatively fixed SVO (Subject-Verb-Object) word order in transitive clauses, but a much freer SV / VS order in intransitive clauses. Cases like this can be addressed by encoding transitive and intransitive clauses separately, with the symbol "S" being restricted to the argument of an intransitive clause, and "A" for the actor/agent of a transitive clause. ("O" for object may be replaced with "P" for "patient" as well.) Thus, Russian is fixed AVO (Agent-Verb-Object) but flexible SV/VS. In such an approach, the description of word order extends more easily to languages that do not meet the criteria in the preceding section. For example, Mayan languages have been described with the rather uncommon VOS word order. However, they are ergative–absolutive languages, and the more specific word order is intransitive VS, transitive VOA (Verb-Object-Absolutive), where the S and O arguments both trigger the same type of agreement on the verb. Indeed, many languages that some thought had a VOS (Verb-Object-Subject) word order turn out to be ergative like Mayan.
Distribution of word order types Every language falls under one of the six word order types; the unfixed type is somewhat disputed in the community, as the languages where it occurs have one of the dominant word orders but every word order type is grammatically correct. The table below displays the word order surveyed by Dryer. The 2005 study surveyed 1228 languages, and the updated 2013 study investigated 1377 languages. Percentage was not reported in his studies.
Hammarström (2016) calculated the constituent orders of 5252 languages in two ways. His first method, counting languages directly, yielded results similar to Dryer's studies, indicating both SOV and SVO have almost equal distribution. However, when stratified by language families, the distribution showed that the majority of the families had SOV structure, meaning that a small number of families contain SVO structure.
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