The comitative case (abbreviated com), also known as the associative case (abbreviated ass), is a grammatical case that denotes companionship, and is used where English would use "in company with" or "together with". It is found in the Korean language, the Finnish language, the Hungarian language, the Mongolian language, and the Estonian language. It is also found in Japanese and many Australian Aboriginal languages where it is very commonly used to form names of places and languages.
In the Estonian language singular comitative is formed by adding the suffix '-ga' to the genitive in case of singular:
- nina (nominative: nose) -> nina (genitive: of nose) -> ninaga (comitative: with a nose)
- koer (nominative: dog) -> koera (genitive: of dog) -> koeraga (comitative: with a dog)
And by adding the suffixes '-de' and '-ga' to the singular partitive in case of plural, thus making first a plural genitive case and then adding the comitative suffix:
- leht (nominative: leaf, page) -> lehte (partitive: leaf) -> lehtede (genitive: of leaves) -> lehtedega (comitative: with leaves)
- kass (nominative: cat) -> kassi (partitive: cat) -> kasside (genitive: of cats) -> kassidega (comitative: with cats)
In the Estonian language comitative is also used to denote when something is used as an implement - kirvega (with axe / using an axe) or as a means of transport laevaga (by boat).
In the Finnish language, the comitative is rare and seldom used in spoken Finnish. The suffix -ne is used alone only when it is an attribute of another word, otherwise additional possessive suffix must be added, such as -ne+en, e.g. suurine vuorineen "with its large mountains". The Finnish literary comitative expresses only possessions or attributes, and as such does not replace the preposition "from". It has only a plural, which is, paradoxically, used to denote both the singular and the plural, e.g. tyttö koirineen "girl with her dog(s)".
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