Translation guide
How to express 'become aware of' in Japanese, covering noticing, realizing, sensing, and learning of something.
問題に気づいた。
I became aware of the problem.
彼女は彼の気持ちに気づいた。
She became aware of his feelings.
To become aware of a fact, situation, or something previously unnoticed.
The most common and versatile way to say 'notice' or 'realize'. Used for both physical noticing and mental realization.
彼が嘘をついていることに気づいた。
I became aware that he was lying.
部屋に入ったとき、誰かがいることに気づいた。
When I entered the room, I became aware that someone was there.
Synonymous with 気づく, but slightly more formal or emphatic. Often used in written language.
彼女は自分の間違いに気がついた。
She became aware of her mistake.
To realize a deeper truth or become enlightened about something. Often used for profound realizations.
彼は人生の意味を悟った。
He became aware of the meaning of life.
To become aware of something through the senses or a feeling.
To feel or sense something, often used for physical sensations or intuitive awareness.
誰かに見られていると感じた。
I became aware that someone was watching me.
危険を感じて、その場を離れた。
I became aware of danger and left the place.
To sense or infer something from subtle cues, often used for reading a situation or someone's feelings.
To become aware of information or news, often through being told or discovering it.
To come to know or learn of something. Often used in the form 知った (found out).
そのニュースを知って驚いた。
I was surprised when I became aware of the news.
彼が結婚したことを昨日知った。
I became aware yesterday that he got married.
Literally 'to hear', used when you become aware of something by hearing it, often casually or incidentally.
To recognize or acknowledge something formally. Often used in technical or official contexts.
問題の重要性を認識する必要がある。
We need to become aware of the importance of the problem.
To notice a specific sensory input like a noise or movement.
Again, 気づく is the default for noticing any sensory input.
後ろから足音が近づいてくるのに気づいた。
I became aware of footsteps approaching from behind.
To catch sight of something; to become visually aware of something.
気づく implies noticing something through your own senses or intuition, often something not explicitly told. 知る implies gaining knowledge, often through being informed or discovering facts. Use 気づく for realizations and sensory awareness; use 知る for learning information.
彼が怒っていることに気づいた。
I noticed he was angry (from his expression).
彼が怒っていることを知った。
I found out he was angry (someone told me).
Avoid directly translating 'become aware of' as 意識するようになる or similar. While grammatically possible, it sounds unnatural. Use the verbs and phrases listed above instead.
彼女の表情から、何かあったのだと察した。
From her expression, I became aware that something had happened.
その噂を耳にしたことはありますか？
Have you ever become aware of that rumor?
窓の外に動くものが目に入った。
I became aware of something moving outside the window.