Whats the difference between Scias and Scipovas?
Scias = to know; scipovas = to know how, in English, the verb "can" can be used too.
"Doesn't Sofia know how to read Chinese?"
"Ĉu Sofia ne scipovas legi la ĉinan?"
"ĉu ne" is a question tag, and the main sentence shouldn't be worded as a question.