ought is a "positive" word, so the question tag should be a "negative"
you can replace "ought" with "should" so a possible question tag is shouldn't
Shouldn't you
You ought to have this question answered by now!
Economic ethics addresses the question, What ought to be?
"The president ought to give away his power, ought he not?"
The tag question is "doesn't he?"
The question tag for "you were" would be "weren't you?"
She is (positive) beautiful, isn't (negative) she?
She can do it correctly, couldn't she? Is the correct question tag of the statement.
Umm, let me think, erm YEH! Are you crazy? you should be ashamed for asking that question... ashamed I tell you... ashamed! HE IS ADORABLE! Who?
he is trash
The tag question for "The book was lost" would be "wasn't it?"
Not sure what is meant by 'tag', but it is spelt as one word - Welcome.