Her sickness is not serious, is it? <-Marked wrong.
Did you report it?
"Her sickness is not severe, is it?" Not accepted and i don't see why.
Apparently there is a difference between illness and sickness. I'm not a native English speaker, but someone explained me the difference in one example.
What's the difference between "cxu" and "cxu ne" at the end of a question?
"Ŝia malsano ne estas grava, ĉu?"
Her illness is not serious, is it?
"Ŝia malsano estas grava, ĉu ne?"
Her illness is serious, isn't it?