let's define what is comparative structure.
(1) Nobody arrived except John.
(2) uk-i-bakk-e sukcey-lul ha-ci-anh-ass-ta.
uk-COM-DELI assignment-ACC do-COMP-not-PAST-DECL.
'Nobody finished the assignment except Uk'
In those cases, English and Korean sentences imply comparison meaning.
We need to define a sentence's semantic features and, at the same time, to define