The Mongolian language (in Mongolian script: monggol qele MoNGgol kele; in Mongolian Cyrillic: mongol khel, mongol khel) is the official language of Mongolia and both the most widely-spoken and best-known member of the Mongolic language family. The number of speakers across all its dialects may be 5.2 million, including the vast majority of the residents of Mongolia and many of the Mongolian residents of the Inner Mongolia Autonomous Region. In Mongolia, the Khalkha dialect, written in Cyrillic (and at times in Latin for social networking), is predominant, while in Inner Mongolia, the language is dialectally more diverse and is written in the traditional Mongolian script. In the discussion of grammar to follow, the variety of Mongolian treated is Standard Khalkha Mongolian (i.e., the standard written language as formalized in the writing conventions and in the school grammar), but much of what is to be said is also valid for vernacular (spoken) Khalkha and for other Mongolian dialects, especially Chakhar.

Modern Mongolian is an agglutinative, almost exclusively suffixing language, the only exception being reduplication. Most of the suffixes consist of a single morpheme. There are many derivational morphemes. For example, the word bajguullagynh consists of the root baj- 'to be', an epenthetic -g-, the causative -uul- (hence 'to found'), the derivative suffix -laga that forms nouns created by the action (like -ation in 'organisation') and the complex suffix -ynh denoting something that belongs to the modified word (-yn would be genitive).  Nominal compounds are quite frequent. Some derivational verbal suffixes are rather productive, e.g. jar'- 'to speak', jarilts- 'to speak with each other'. Formally, the independent words derived using verbal suffixes can roughly be divided into three classes: final verbs, which can only be used sentence-finally, i.e. -na (mainly future or generic statements) or -o (second person imperative); participles (often called "verbal nouns"), which can be used clause-finally or attributively, i.e. -san (perfect-past) or -maar ('want to'); and converbs, which can link clauses or function adverbially, i.e. -z (qualifies for any adverbial function or neutrally connects two sentences) or -tal (the action of the main clause takes place until the action expressed by the suffixed verb begins).  Roughly speaking, Mongolian has eight cases: nominative (unmarked), genitive, dative, accusative, ablative, instrumental, comitative and directional. If a direct object is definite, it must take the accusative, while it must take the nominative if it is unspecific. In addition to case, a number of postpositions exist that usually govern genitive, ablative, or comitative case or a form of the nominative that has sometimes -Vn either for lexical historical reasons or analogy (thus maybe becoming an attributive case suffix). Nouns can take reflexive-possessive clitics indicating that the marked noun is possessed by the subject of the sentence: bi najz(-)aa avarsan I friend-reflexive-possessive save-perfect 'I saved my friend'. However, there are also somewhat noun-like adjectives to which case suffixes seemingly cannot be attached directly unless there is ellipsis. Plurality may be left unmarked, but there are overt plurality markers, some of which are restricted to humans. A noun that is modified by a numeral usually does not take any plural affix.  Personal pronouns exist for the first and second person, while the old demonstrative pronouns have come to form third person (proximal and distal) pronouns. Other word (sub-)classes include interrogative pronouns, conjunctions (which take participles), spatials, and particles, the last being rather numerous.  Negation is mostly expressed by -guj after participles and by the negation particle bis after nouns and adjectives; negation particles preceding the verb (for example in converbal constructions) exist, but tend to be replaced by analytical constructions.

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