Kimi evde kaldı, kimi dışarı çıktı.

Here kimi means some or some of them.

In the pattern kimi ..., kimi ..., Turkish is dividing one group into parts:

• Kimi evde kaldı = some stayed at home
• Kimi dışarı çıktı = some went out

A natural English translation is Some stayed at home, others went out.

Not here.

Kimi can mean whom in other sentences, for example:

• Kimi gördün? = Whom did you see?

But in Kimi evde kaldı, kimi dışarı çıktı, it is not a question word. It is a distributive word meaning some.

So the meaning depends on context.

Because Turkish often repeats it to contrast different parts of a group.

So kimi ..., kimi ... means:

• some ..., some ...
• or more naturally in English, some ..., others ...

This repetition is a normal Turkish pattern.

Other similar examples:

• Kimi geldi, kimi gelmedi. = Some came, others did not.
• Kimi sevdi, kimi sevmedi. = Some liked it, others did not.

Yes, often there is.

In this sentence, kimi really means something like some people or some of them, depending on the context.

So the full idea could be:

• Kimi insanlar evde kaldı, kimi insanlar dışarı çıktı
• or Grubun kimi üyeleri evde kaldı, kimi üyeleri dışarı çıktı

But Turkish very naturally leaves that noun unstated when it is obvious.

Evde comes from:

• ev = house, home
• -de = in, at

So evde means at home or in the house.

In evde kaldı, the verb kalmak means to stay / remain, so:

• evde kaldı = stayed at home

English often says stayed home without a preposition, but Turkish usually uses the locative form: evde.

They are both in the simple past tense.

• kaldı = stayed
• çıktı = went out / went outside

More specifically:

• kalmak → kaldı
• çıkmak → çıktı

Both are third person singular past forms.

Because each clause uses kimi as its subject, and in this kind of Turkish structure the verb normally appears in third person singular.

So:

• Kimi evde kaldı
• Kimi dışarı çıktı

is completely normal.

Turkish often does not mark the verb as plural in third person unless there is a reason to emphasize it. That is why singular verbs here do not sound strange to a native speaker.

Because dışarı çıkmak is a very common expression meaning to go out or to go outside.

So:

• dışarı çıktı = went out

You may also hear dışarıya çıktı, which is also correct. The version with -ya can sound a little more directional, but in everyday Turkish dışarı çıktı is extremely common and natural.

Yes.

These are all possible:

• Kimi evde kaldı, kimi dışarı çıktı
• Kimileri evde kaldı, kimileri dışarı çıktı
• Bazıları evde kaldı, bazıları dışarı çıktı

They are similar, but there are small differences in feel:

• kimi ... kimi ... is a compact, established pattern
• kimileri sounds a bit fuller
• bazıları is often very clear and common in everyday use

All of them can mean some ..., others ....

The given word order is the most neutral and natural one.

Turkish usually puts the verb at the end, so:

• Kimi evde kaldı, kimi dışarı çıktı

sounds standard.

You could change the order for emphasis, for example:

• Kimi kaldı evde, kimi çıktı dışarı

But that sounds more marked or stylistic. For learners, the original version is the best basic pattern to remember.