The Japanese language has a highly regular agglutinative verb morphology, with both productive and fixed elements. Typologically, its most prominent feature is topic creation: Japanese has prominent topics (although it is possible for topics and subjects to be distinct). Grammatically, Japanese is an SOV dependent-marking language, with verbs always constrained to the sentence-final position, except in some rhetorical and poetic usage. The word order is free as long as the order of dependent-head is maintained among all constituents: the modifier or relative clause precedes the modified noun, the adverb precedes the modified verb, the genitive nominal precedes the possessed nominal, and so forth. Thus, Japanese is a strongly left-branching language; to contrast, Romance languages such as Spanish are strongly right-branching, and Germanic languages such as English are weakly right-branching.