1.
oneself, myself, yourself
Refers to the speaker or the subject of the sentence.
自分でやってみてください。
Please try doing it yourself.
自分の部屋を掃除した。
I cleaned my own room.
自分のことは自分でする。
I do my own things myself.
自分の意見を言ってください。
Please state your own opinion.
自分でお弁当を作って学校に持っていった。
I made a boxed lunch myself and took it to school.
自分 is a reflexive pronoun meaning "oneself." Unlike English, it is not limited to the speaker — it refers back to the subject of the sentence, whoever that may be.
COMMON PATTERNS:
- 自分で: by oneself (emphasizes doing it independently)
- 自分の: one's own (自分の部屋 = one's own room)
- 自分自身: oneself (emphatic)
- 自分のことは自分でする: to do one's own things by oneself
FLEXIBLE REFERENCE:
自分 refers to whoever is the subject:
- 私は自分で作った (I made it myself)
- 彼は自分の間違いに気づいた (He noticed his own mistake)
AS FIRST-PERSON PRONOUN:
In casual male speech (especially military, sports contexts), 自分 is sometimes used to mean "I/me" directly: 自分はそう思います (I think so).