At a glance
だれか means "someone". In questions it is often translated as "anyone". It is used when you don't know who the person is, or when it doesn't matter.
だれか + particle (が / を / に / と / の) + ...
だれかが窓を開けました。 Someone opened the window.
How to form it
だれか works like a noun, so particles attach after it:
| Use | Example | Meaning |
|---|---|---|
| Subject (が) | だれかが来ました。 | Someone came. |
| Object (を) | だれかを待っています。 | I'm waiting for someone. |
| Person you do something to (に) | だれかに聞いてください。 | Please ask someone. |
| Together with (と) | だれかと話しています。 | (He) is talking with someone. |
| Possessive (の) | だれかの傘があります。 | There's someone's umbrella. |
In casual speech, が and を after だれか are often dropped: だれか来た。 "Someone came."