Translation guide
In Japanese, 'someone' is often expressed through indefinite pronouns like 誰か (dareka), but the natural choice depends on context, politeness, and whether the person is unknown, unspecified, or hypothetical. Unlike English, Japanese frequently omits the subject when it's clear from context, so 'someone' may not need to be explicitly stated.
誰かがドアにいます。
Someone is at the door.
誰か手伝ってくれる人が必要です。
I need someone to help me.
Referring to a person whose identity is not known or not important, in statements.
The most common and neutral way to say 'someone'. Used in positive statements and questions when the person's identity is unknown or unspecified.
Someone knocked on the door.
誰か助けて！
Someone help!
Literally 'a certain person', used when referring to a specific but unnamed individual, often in storytelling or formal contexts.
ある人が私にこう言った。
Someone (a certain person) said this to me.
Implies an unknown person with a sense of mystery or suspicion, often used in formal or literary contexts.
何者かが彼を殺した。
Someone (unknown person) killed him.
Asking if any person exists, or stating that no person exists.
Used in questions to ask if there is anyone. In negative statements, 誰も is more common for 'no one', but 誰か can appear in negative contexts meaning 'anyone'.
Used with negative verbs to mean 'no one' or 'not anyone'. Not directly 'someone', but often corresponds to English 'someone' in negative contexts.
Only used with negative predicates. 誰もいない means 'there is no one', not 'someone is not here'.
誰もいなかった。
There was no one. / Someone wasn't there. (ambiguous in English, but in Japanese it means 'no one was there')
Referring to a person who has achieved something or is notable, similar to 'somebody' in English.
Literally 'big thing', used to mean an important or influential person, a 'somebody'.
彼は将来大物になるだろう。
He will become someone important in the future.
Means 'person' or 'character', but can imply a person of note or ability when used in certain contexts.
An idiomatic phrase meaning 'not an ordinary person', implying someone special or formidable.
あの新人、ただ者じゃないね。
That new guy is someone special, isn't he?
Talking about a person in a hypothetical situation, like 'if someone were to...'
Still the most natural choice in hypotheticals.
誰かがそんなことをしたら、怒るだろう。
If someone did that, I would be angry.
Explicit conditional pattern with もし (if) for clarity.
もし誰かが来たら、教えてください。
If someone comes, please let me know.
Japanese often omits the subject. If it's obvious you're talking about a person, you may not need to say 誰か. For example, 'Someone took my pen!' could just be ペンがなくなった！ (My pen is gone!) if the focus is on the missing item.
誰か is 'someone' in positive contexts; 誰も is 'anyone' or 'no one' in negative contexts. 誰か is not used with negative verbs to mean 'no one'.
彼はただ者ではない、大した人物だ。
He's not just anybody; he's someone remarkable.