은가요

Gentle polite question about a quality

-은가요 turns a description into a soft polite question: 오늘은 클럽이 바쁘지 않은가요? 'is the club not busy today?' It is warmer and less blunt than -습니까, which is why hosts and teachers use it when addressing an audience. It goes with descriptive words and 이다; with action verbs you use -나요 instead — one line here is literally a grammar lesson pairing the two.

Register: polite, addressing an audience