Мы делим одну комнату.

Because комната is a feminine noun, and here it is the direct object of the verb, so it must be in the accusative case.

• Nominative: одна комната = one room
• Accusative: одну комнату = one room (as the object)

So одна changes to одну to match the case of комнату.

For the same reason: it is the direct object of делим.

The verb делить takes a direct object, so комната must go into the accusative singular:

• Nominative: комната
• Accusative: комнату

This is a very common pattern with feminine nouns ending in -а:

• книга → книгу
• машина → машину
• комната → комнату

Делим is the 1st person plural present tense form of делить.

So:

• делить = to divide / to share
• делим = we divide / we share

The ending -им tells you it means we.

Yes, it can mean both, depending on context.

The basic idea of делить is to divide or to apportion, but in sentences like this it often means to share in the sense of using something together.

So Мы делим одну комнату most naturally means:

• We share one room

But literally, the verb is related to dividing/sharing something between people.

Yes, literally it could, but in normal English that sounds odd unless you mean physically splitting the room or dividing it into parts.

In everyday usage, this Russian sentence usually means:

• We share one room

So the natural English translation is share, even though the Russian verb is closely related to divide.

Yes, делим already tells you the subject is we.

Russian often omits subject pronouns when they are clear from the verb ending. So both of these are possible:

• Мы делим одну комнату.
• Делим одну комнату.

Including мы can make the subject more explicit or slightly more emphatic. It is completely normal here.

Yes. Russian word order is more flexible than English word order.

The neutral order here is:

• Мы делим одну комнату.

But you could also hear:

• Одну комнату мы делим.
• Комнату одну мы делим. (more marked / context-dependent)

Changing the order usually changes the focus or emphasis, not the basic meaning.

Yes, Мы делим комнату is also possible.

Adding одну emphasizes that it is one room:

• maybe to contrast with two rooms,
• or to stress that both people are in the same single room.

So:

• Мы делим комнату = We share a room
• Мы делим одну комнату = We share one room

In English, one may sound more emphatic than in Russian, depending on context.

Primarily, одну is the accusative form of one. But like one in English, it can sometimes sound less strictly numerical and more like a single or one particular.

So in this sentence it may simply stress that there is just one room.

Russian has no articles like a or the, so words like один / одна / одно sometimes help add that kind of nuance.

Because делить and делиться are different verbs.

• делить = to divide / share something
• делиться = to share with someone, often in the sense of giving part of something, or sharing information/feelings

Examples:

• Мы делим комнату. = We share a room.
• Он делится едой с братом. = He shares food with his brother.

So for sharing a room, делим is the correct choice.

It is accusative singular.

Reason:

• делить is a transitive verb
• the thing being shared is the direct object
• direct objects are commonly in the accusative case

Both words change to accusative:

• одна → одну
• комната → комнату

Комната is inanimate.

That matters because in Russian, the accusative behaves differently for animate and inanimate nouns, especially in masculine forms. For this noun, the important point is simply that it is a feminine inanimate noun, and its accusative singular ends in -у:

• комната → комнату

So yes, animacy is part of the bigger grammar system, but here the main issue is that the noun is feminine singular in the accusative.

A careful pronunciation is roughly:

My DYE-lim ad-NOO KOM-na-too

A few notes:

• Мы sounds like my, but shorter and with a Russian ы sound.
• делим has stress on the first syllable: ДЕлим
• одну has stress on the second syllable: одНУ
• комнату has stress on the first syllable: КОмнату

In connected speech, unstressed vowels are reduced, so the real pronunciation is less neat than the spelling suggests.

Делить is imperfective.

That matters because the imperfective is used for:

• ongoing actions,
• habitual actions,
• general situations.

So Мы делим одну комнату describes a general state or ongoing arrangement: we share one room.

If you used a perfective verb, the meaning would shift toward a completed act of dividing, not the normal idea of sharing a room.

A common perfective partner is разделить or sometimes поделить, depending on meaning.

For example:

• Мы разделили комнату. = We divided the room.
• Мы поделили комнату. = We split/shared the room between us.

But these usually suggest a completed action of dividing or splitting, not the everyday state of sharing a room. That is why делим works better in your sentence.

Yes, it is grammatical and understandable.

However, depending on context, a native speaker might also say:

• Мы живём в одной комнате. = We live in one room / We stay in the same room
• Мы живём в одной комнате вместе.
• Мы живём в одной комнате общежития, etc.

Your sentence is still perfectly valid, especially if the point is specifically that the room is shared.