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이 쓰는

uses

→ 이
phrase Uncommon #12,786
uses 이 is a subject marker, and 쓰는 is the present form of 쓰다, which can mean “use” or “write” depending on context. The examples also show other forms of 쓰다.
KO: 선생님이 쓰는 표현은 정말 재미있어요.
EN: The expression the teacher uses is really interesting.