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気づく， 気付く， きづく
1. to notice, to realize, to realise, to become aware (of), to perceive, to sense, to suspect
2. to regain consciousness, to come to (one's senses), to come round
注意到，意识到，感觉到
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd
