Comitative case

The Comitative case 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.

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).