I understood the first time I heard about the locative that it was usually reserved for monosyllabic masculine nouns (ex. чай, дом, сок) with exceptions (кровь, дверь). However, I recently saw that на дому is the correct usage for describing activities inside of a house, whereas на доме for activities on the roof.

But just today, I notice that the locative case isn't used once it is modified by an adjective? For example, I can find no record of the sentence на моём дому online, but instead, I see на моём доме. Are there any concrete rules to tell me when to use the locative, as what I am learning seems arbitrary.

  • I'm afraid there're no formal rules on the Vocative case, because in Russian it is only recognized by linguists and regarded by them as a relic of the Old Russian and as highly irregular, they still research it and don't have all the answers... The lack of its recognition manifests in its relegation to the Prepositional case as its 2nd form. I'd repost the link given below by @Sergey Slepov to a very instructive article by a linguist Plungian "On the semantics of the Russian Locative (2nd Prepositional case)" – Баян Купи-ка Mar 17 '18 at 21:26

But just today, I notice that the locative case isn't used once it is modified by an adjective?

Not quite, it's totally correct to say

На белом/рыхломadj. снегУ
На крутомadj. валУ
В горячемadj. боЮ
В дремучемadj. лесУ
На нашемposs. pron. векУ
В новомadj. портУ
В дальнемadj. краЮ
В цветущемadj. садУ
В липкомadj. потУ
На своёмposs. pron. х..Ю
В ночномadj. бредУ

I'd argue that дом is unique, because its Locative has only survived for limited use in а particular sense of working from home. In fact despite being written separately на + дому, semantically it functions as an adverb (which are to be written jointly with prepositions), because it can answer not only the question where? but also how?, and this i believe is the reason for its reversal to Prepositional case once this fossilized semantic unity is broken up by insertion of intermediate words.


Locative is pretty much arbitrary indeed.

To further complicate things, some of the words which technically have locative only use it in set phrases or in certain senses.

Дом is one of such words. While в дому still can be understood, it has long since fallen out of use in live Russian speech, and на дому is a set phrase meaning "at home" in the context of work: работа на дому means "outwork" and надомник means "outworker".

You can't really say на моём дому nowadays.

Other words like this are мир (в миру can only be used in the sense of "secular world"), щит (в щиту means "in the electric panel") and several others.

  • 3
    В щиту must be a very slangy expression. I've never heard it, although I'm an electrical engineer. – AlexVB Mar 15 '18 at 7:25

First of all, don't believe the other answers telling you that the locative is arbitrary and that there are no rules.

Locative is not arbitrary: for some words its use is required: в глазу, в боку, в саду; others (the majority) do not have a distinct locative form: в столе, в городе. It would be wrong to use them with the ending -у: в столу, в городу; and it would be wrong to say в глазе, в боке, в саде.

Are there any concrete rules to tell me when to use the locative?

Short answer: Yes, there are a few trends. Read the long answer.

Long answer:

In the course of the last few hundred years Locative (and Partitive) were gradually phased out of the language. Some words have lost their locatives completely. E.g. my granddad (born 1929) would say "в отпуску". Nowadays this sounds peculiar, "в отпуске" is pretty much the only way of saying it.

Some words are "hesitating" (to various degrees): мозг, счёт (на вашем счёте/счету осталось...), аэропорт, цех, мост (дырка в мосте / в мосту):

Some have split meanings:

В углу комнаты лежит мяч.
В прямом угле 90 градусов.

На краю земли.
В Краснодарском крае.

В миру
В мире

Others have only kept locatives in set phrases: на нашем веку (vs в двадцатом веке), на виду (vs в нетрезвом виде), на дому (vs на доме), час (в пятом часу vs в одном часе 60 секунд).

You are not finding any examples of "на моём дому" because "на дому" is a set phrase.

Most high-frequency words continue to hold on to their locatives quite firmly: час, глаз, бок, лес, снег, берег...

There are a few towns / villages called "Сосновый бор" and "Старый мост". I'd really like to hear how those people describe where they live!


There are no rules for locative cases but rather sporadic usages that are evidence of having locative (to some extent) earlier.

Usages of phrases like на дому, на снегу etc. should be memorized and that's it.

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