Comitative case
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The comitative case is the case that denotes companionship, and is used where English would use "in company with" or "together with". It, and many other cases, are found in the Finnish language, the Hungarian language, and the Estonian language. It is also found in many Australian Aboriginal languages where it is very commonly used to form names of places and languages.
In the Estonian language comitative is formed by adding the suffix '-ga' to the genitive in case of singular:
- nina (nominative: nose) -> nina (genitive) -> ninaga (comitative: with a nose)
- koer (nominative: dog) -> koera (genitive) -> koeraga (comitative: with a dog)
And by adding the suffixes '-de' and '-ga' to the partitive in case of plural:
- leht (nominative: leaf, page) -> lehte (partitive) -> lehtedega (comitative: with leaves)
- kass (nominative: cat) -> kassi (partitive) -> 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 not used in spoken Finnish. The suffix -ne is used alone only when it's 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 the both the singular and the plural, e.g. tyttö koirineen "girl with her dog(s)".
In the expressions corresponding to the Estonian ones above, the adessive may be used, e.g. lehdillä "with leaves" or laivalla "by boat". The idea of "being in company" is expressed with genitive + kanssa, e.g. tyttö koiran kanssa "girl with dog". In spoken Finnish, this abbreviates to a clitic very similar to the Estonian comitative, -nkaa (via -nkans). It is debatable if this is a grammatical case, because it does not obey vowel harmony; that is, there is no form -nkää. Some dialects do have such a form, however.
