Basic word order refers to the order in which the major constituents of a sentence appear under ordinary circumstances. These constituents are: the subject, the (direct) object, and the verb. The ordering of these three elements correlates with many other aspects of a language's grammar, so describing a language's basic word order early is extremely helpful.
Because there are three elements, there are six possible orderings of them. But not all are equally common: in fact, the overwhelming majority of languages studied use one of two patterns. These common patterns are subject-object-verb (SOV; the most common) and subject-verb-object (SVO). One more order, verb-subject-object (VSO), is less common, and patterns much like SVO languages.
The other three orders, where the object precedes the subject, are extremely rare.
Languages differ in how rigidly they adhere to this basic word order. Some languages do not allow any deviation from their basic word order, while others allow multiple alternative orders. Russian is an example of a language with flexible word order.
Usually, the choice of word order in a given sentence is determined by pragmatic factors (e.g., focus: picking out an element of the sentence to contrast with something else).
It is also possible for a language to allow this kind of flexibility in word order to the degree that it can't be said to have a dominant word order.
Mila-qa vikuña-n-kuna-ta riku-ra. Melanie-CASE vicuña-her-PL-CASE see-AGR.PAST 'Melanie saw her vicuñas.' (283)
Xüü öcigdör oxin-d nom ög-sön. boy yesterday girl-to book give-AGR 'The boy gave a book to the girl yesterday.' (170)
Il-āt-um ḫurāṣ-am ša šarrim i-ṣbat-ā._ god-FEM-CASE.PL gold-CASE.SG REL king-CASE.SG AGR.PAST-seize-AGR.PST 'The goddesses seized the king's gold. (20)
Fatma a-na-m-penda Suhail. Fatma AGR-PRES-AGR-love Suhail 'Fatma loves Suhail.' (244)
Southern Min: SVO
Gua2 sang3 i1 tsit8-niann2 sann1. I give him one-CLASS shirt 'I gave him a shirt' (25)
Geographically, SOV order occurs worldwide, but is particularly dominant in:
SVO order is dominant in:
SVO order is rare outside of these areas.
VSO order, although uncommon worldwide, occurs in several clusters:
Languages with no fixed word order are not especially common, but they tend to occur in:
When determining a language's basic word order, we look at the order used in statements (e.g. rather than questions) and in context where there are no pragmatic factors influencing word order. English is an SVO language (I eat pizza), but in certain contexts other orders are possible. For example, when contrasting the object of a sentence with another potential object, the object can come first: Pizza I eat but cake I don't touch..
Matthew S. Dryer. 2013. Order of Subject, Object and Verb. In: Dryer, Matthew S. & Haspelmath, Martin (eds.) The World Atlas of Language Structures Online. Leipzig: Max Planck Institute for Evolutionary Anthropology. (Available online at http://wals.info/chapter/81, Accessed on 2020-10-11.)