The comitative

1. Use

The comitative is rare and not used in spoken Finnish. It expresses the presence of something. It often corresponds with "in company of" or "together with".

Finnish English
tyttö koirineen the girl and her dog(s)
mies perheineen the man and his family
pienine perheineni with my small family
papereineen kaikkineen with all the papers
tohtori Virtanen puolisoineen doctor Virtanen with his partner
Hän tuli kauniine vaimoineen. He came with his beautiful wife.

2. Formation

The comitative ending is -ne, and always in the plural. A singular form doesn't exist, but plural forms are always used, no matter if the meaning is singular or plural. The nouns require a possessive suffix as well. The comitative is formed using the strong-grade plural stem (the same stem you use for the plural illative (mihin).

Finnish English
Minä menin saunaan ystävineni. I went to the sauna with my friend(s).
Sinä menit saunaan ystävinesi. You went to the sauna with your friend(s).
Hän meni saunaan ystävineen. He went to the sauna with his friend(s).
Me menimme saunaan ystävinemme. We went to the sauna with our friend(s).
Te menitte saunaan ystävinenne. You went to the sauna with your friend(s).
He menivät saunaan ystävineen. They went to the sauna with their friend(s).

Notice that the verb doesn't get plural when you include other people in the sentence!