Новая грамматическая тема: местоимения с частицей «кое-» — «кое-что», «кое-кто», «кое-где», «кое-как».

Кое- makes the word indefinite, but not in a completely neutral way. It often suggests that the speaker:

• knows more than they are saying,
• has something specific in mind,
• or wants to stay vague on purpose.

So:

• кое-кто = someone / certain people
• кое-что = something / a few things
• кое-где = in some places
• кое-как = somehow / with difficulty / badly

A useful rule of thumb: кое- often feels like some... / a certain... / somehow, with a hint of I could be more specific, but I am not.

Both can translate as someone, but the nuance is different.

• кто-то = an unspecified person; the speaker may not know who
• кое-кто = a particular person or some particular people; the speaker often knows, or does not want to say directly

Compare:

• Кто-то звонил. = Someone called.
  The speaker may have no idea who it was.

• Кое-кто звонил. = Someone called.
  This often suggests: I know who, or I have someone specific in mind, but I am not naming them.

This is one of the most important differences for learners.

These forms are all indefinite, but they are used in different situations.

A simple comparison:

• кое-кто = some specific person / someone in particular
• кто-то = someone, neutral
• кто-нибудь = anyone / someone at all
• кто-либо = anyone / any person whatsoever, usually more formal or written

Examples:

• Мне нужно кое с кем поговорить. = I need to talk to someone in particular.
• Там кто-то стоит. = Someone is standing there.
• Позови кого-нибудь. = Call someone, anyone.
• Если кто-либо знает ответ, скажите. = If anyone knows the answer, say so.

So кое- usually points to a more specific but still unnamed person, thing, place, or manner.

Because кое- is normally attached to the following pronoun or adverb with a hyphen:

• кое-кто
• кое-что
• кое-где
• кое-как

But there is an important exception:

If there is a preposition, the preposition goes between кое and the pronoun, and the hyphen disappears.

For example:

• кое с кем = with someone
• кое у кого = at someone’s place / from someone
• кое о чём = about something
• кое к кому = to someone

So:

• no preposition -> кое-кто
• with preposition -> кое с кем

This is a very common spelling pattern in Russian.

Yes. They decline like кто and что, with кое- added.

Common forms:

For кое-кто:

• nominative: кое-кто
• genitive / accusative: кое-кого
• dative: кое-кому
• instrumental: кое-кем
• prepositional: кое о ком

For кое-что:

• nominative / accusative: кое-что
• genitive: кое-чего
• dative: кое-чему
• instrumental: кое-чем
• prepositional: кое о чём

Examples:

• Я кое-кого знаю. = I know someone / certain people.
• Мы говорили кое о чём важном. = We talked about something important.
• Мне нужно кое с кем встретиться. = I need to meet with someone.

But кое-где and кое-как are adverbs, so they do not decline.

Good question. Strictly speaking:

• кое-кто and кое-что are pronouns
• кое-где and кое-как are adverbs

But Russian textbooks often teach them together because they all use the same particle кое- and have a similar indefinite meaning.

So the lesson title is a bit simplified. It is really about indefinite words with the particle кое-, not only pronouns in the narrow grammatical sense.

Yes. Кое-что is flexible.

It can mean:

• something
• a few things
• certain things

Examples:

• Я хочу тебе кое-что сказать. = I want to tell you something.
• Мне нужно купить кое-что. = I need to buy a few things / something.
• Кое-что изменилось. = Some things have changed / something has changed.

So the exact English translation depends on context. Russian uses кое-что more broadly than English uses a single word.

It often has a negative or weak-result meaning.

Depending on context, кое-как can mean:

• somehow
• with difficulty
• barely
• sloppily
• in a makeshift way

Examples:

• Он кое-как дошёл до дома. = He somehow / with difficulty made it home.
• Она кое-как закончила работу. = She barely finished the work.
• Они сделали это кое-как. = They did it badly / carelessly.

So кое-как is often not neutral. It can imply that something was done poorly, with effort, or without proper quality.

Usually, not ideally.

If you genuinely do not know, Russian often prefers:

• кто-то = someone
• что-то = something
• где-то = somewhere

Use кое- when there is at least some sense of specificity, or when you are intentionally vague.

Compare:

• Кто-то стучит в дверь. = Someone is knocking at the door.
  I do not know who it is.

• Кое-кто стучал в дверь вчера вечером. = Someone was knocking at the door last night.
  This suggests I may know or suspect who.

So if you are completely ignorant of the identity, кто-то / что-то / где-то is often the safer choice.

Yes, very common.

Especially:

• кое-что
• кое-кто
• кое-как

They are normal in everyday speech and writing.

A few style notes:

• кое-кто often sounds slightly suggestive, as if the speaker is hinting at a person without naming them.
• кое-что is very common and natural.
• кое-как is also common, especially in conversation.
• кое-где is normal too, though it may appear a bit more often in narration or description.

So these are useful, practical words, not rare grammar-book vocabulary.

Yes, sometimes they can.

For example:

• кое-кто can mean certain people
• кое-что can mean certain things / a few things

This depends on context.

Examples:

• Кое-кто уже ушёл. = Some people have already left.
• Кое-что я ещё не понял. = There are still a few things I have not understood.

Grammatically, these forms are built from singular pronouns, but in real use they can refer to plural ideas in English. That is very normal.

A useful shortcut is:

кое- = some... / a certain... / somehow, with a hint of hidden specificity

So you can remember:

• кое-кто = some person, a certain person
• кое-что = some thing, a certain thing
• кое-где = in some places
• кое-как = somehow, often not very well

If you remember the idea indefinite, but not totally random, you will usually understand the feeling of кое- correctly.