〜に気がつく

About

The expression 〜に気きが付つく is used to express that one "realizes" or "notices" something. Since 気き can be thought of as one's "attention" or "mental focus", we can think of this expression literally as "one's focus attaches to".

〜に気きが付つく may attach to a noun or a nominalized verb.

In this expression, に functions to mark the preceding noun or nominalized verb as the "target" of 気きが付つく. に and the noun it marks may sometimes be omitted.

The verb 気きづく may also be used nearly interchangeably with 気きが付つく. The only difference is that 気きづく may not be used in phrases such as 「よく気きが付つく人ひと」("an attentive person").

Summary

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  Use 〜に気きが付つく to express that someone "notices" or "realizes" something.

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  〜に気きが付つく can attach to a noun or nominalized verb.

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  気きが付つく may be substituted for the 気きづく as well, with no change in meaning.