Word order

In linguistics, word order typology is the study of the order of the syntactic constituents of a language, and how different languages can employ different orders. Correlations between orders found in different syntactic sub-domains are also of interest. The primary word orders that are of interest are the constituent order of a clause – the relative order of subject, object, and verb; the order of modifiers (adjectives, numerals, demonstratives, possessives, and adjuncts) in a noun phrase; and the order of adverbials.

Some languages use relatively restrictive word order, often relying on the order of constituents to convey important grammatical information. Others—often those that convey grammatical information through inflection—allow more flexibility, which can be used to encode pragmatic information such as topicalisation or focus. Most languages, however, have a preferred word order, and other word orders, if used, are considered "marked".

Most nominative–accusative languages—which have a major word class of nouns and clauses that include subject and object—define constituent word order in terms of the finite verb (V) and its arguments, the subject (S), and object (O).

There are six theoretically possible basic word orders for the transitive sentence: subject–verb–object (SVO), subject–object–verb (SOV), verb–subject–object (VSO), verb–object–subject (VOS), object–subject–verb (OSV) and object–verb–subject (OVS).

The overwhelming majority of the world's languages are either SVO or SOV, with a much smaller but still significant portion using VSO word order. The remaining three arrangements are exceptionally rare, with VOS being slightly more common than OSV, and OVS being significantly more rare than the two preceding orders.

A paper by Murray Gell-Mann and Merritt Ruhlen, building on work in comparative linguistics, asserts that the distribution of word order types in the world's languages was originally SOV. The paper compares a survey of 2135 languages with a "presumed phylogenetic tree" of languages, concluding that changes in word order tend to follow particular pathways, and the transmission of word order is to a great extent vertical (i.e. following the phylogenetic tree of ancestry) as opposed to horizontal (areal, i.e. by diffusion). According to this analysis, the most recent ancestor of currently known languages was spoken recently enough to trace the whole evolutionary path of word order in most cases.

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