Translation guide
In Japanese, referring to a 'certain person' often depends on context, politeness, and whether the person's identity is known or unknown. Direct translations exist but are less common than using names, titles, or omission.
The speaker knows who the person is but chooses not to name them, often for privacy or narrative effect.
The most direct and common translation. Used when the speaker knows the person but does not specify their identity. Neutral in tone.
ある人が私にそう言いました。
A certain person told me that.
Slightly more formal or literary than ある人. Often used in written narratives or when emphasizing the person's role.
とある人物が事件の鍵を握っている。
A certain person holds the key to the case.
Very formal, often used in legal or official contexts. Implies the person's identity is known but deliberately concealed.
某人物が関与していると報じられた。
It was reported that a certain person is involved.
The speaker does not know who the person is, similar to 'someone' or 'some person'.
The most common way to say 'someone' or 'a certain person' when the identity is unknown. Casual and widely used.
誰かがドアをノックした。
A certain person (someone) knocked on the door.
More emphatic and often used when the unknown person is suspicious or mysterious. Can sound dramatic.
何者かが夜中に侵入した。
A certain person (some unknown individual) broke in during the night.
In Japanese, it is often more natural to use a name, title, or relationship term rather than a vague phrase like 'certain person'.
If the person's name or title is known, use it directly. Japanese prefers specific references over vague ones when possible.
田中さんがそうおっしゃいました。
A certain person (Mr. Tanaka) said so.
Words like 友達 (friend), 同僚 (colleague), or 知人 (acquaintance) can replace 'certain person' when the relationship is relevant.
友達から聞いたんだけど。
I heard it from a certain person (a friend).
Japanese often omits the subject when it is obvious from context, making 'certain person' unnecessary.
If the listener already knows who you are talking about, simply omit the reference. This is very natural in Japanese.
そう言ってたよ。
A certain person said so. (when context is clear)
Direct translations like ある人 can sound stiff or literary in casual conversation. Use names, titles, or omission instead.
さっき誰かが来たよ。
A certain person came by just now. (natural)