Japanese grammar

Japanese has a regular agglutinative subject-object-verb (SOV) morphology, with both productive and fixed elements. In language typology, it has many features divergent from most European languages. Its phrases are exclusively head-final and compound sentences are exclusively left-branching. There are many such languages, but few in Europe. It is a topic-prominent language.

The modern theory of constituent order ("word order"), usually attributed to Joseph Greenberg, identifies several kinds of phrase. Each one has a head and possibly a modifier. The head of a phrase either precedes its modifier (head initial) or follows it (head final). Some of these phrase types, with the head marked in boldface, are:

Some languages are inconsistent in constituent order, having a mixture of head initial phrase types and head final phrase types. Looking at the preceding list, English for example is mostly head initial, but nouns follow the adjectives which modify them. Moreover, genitive phrases can be either head initial or head final in English. Japanese, by contrast, is the epitome of a head final language:

Head finality in Japanese sentence structure carries over to the building of sentences using other sentences. In sentences that have other sentences as constituents, the subordinated sentences (relative clauses, for example), always precede what they refer to, since they are modifiers and what they modify has the syntactic status of phrasal head. Translating the phrase the man who was walking down the street into Japanese word order would be street down was walking man. (Note that Japanese has no articles, and the different word order obviates any need for the relative pronoun who.)

Head finality prevails also when sentences are coordinated instead of subordinated. In the world's languages, it is common to avoid repetition between coordinated clauses by optionally deleting a constituent common to the two parts, as in Bob bought his mother some flowers and his father a tie, where the second bought is omitted. In Japanese, such "gapping" must precede in the reverse order: Bob mother for some flowers and father for tie bought. The reason for this is that in Japanese, sentences (other than occasional inverted sentences or sentences containing afterthoughts) always end in a verb (or other predicative words like adjectival verbs, adjectival nouns, auxiliary verbs)—the only exceptions being a few particles such as ka, ne, and yo. ka turns a statement into a question, while the other sentence-final particles express the speaker's attitude towards the statement.

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