A topic-prominent language is a language that organizes its syntax to emphasize the topic–comment structure of the sentence. The term is best known in American linguistics from Charles N. Li and Sandra Thompson, who distinguished topic-prominent languages, such as Korean and Japanese, from subject-prominent languages, such as English.
In Li and Thompson's (1976) view, topic-prominent languages have morphology or syntax that highlights the distinction between the topic and the comment (what is said about the topic). Topic–comment structure may be independent of the syntactic ordering of subject, verb and object.
Santali is characterized by a split into at least a northern and southern dialect sphere, with slightly different sets of phonemes: Southern Santali has six phonemic vowels, in contrast with eight or nine in Northern Santali, different lexical items, and to a certain degree, variable morphology. Santali is recognized by linguists as being phonologically conservative within the Munda branch. Unlike many Munda languages that had their vowel systems restructured and shrunk to five such as Mundari, Ho, and Kharia, Santali retains a larger vowel system of eight phonemic cardinal vowels, which is very unusual in the South Asian linguistic area. The language also uses vowel harmony processes in morphology and expressives similar to Ho and Mundari. Morphosyntactically, Santali, together with Sora, are considered less restructured than other Munda languages, having less influence from Indo-Aryan and Dravidian languages. Clause structure is topic-prominent by default.