(also tag) noun [C] a short phrase such as 'isn't it?' or 'did you?' at the end of a sentence that changes it into a question and is often used to ask sb to agree with you 疑问尾句，附加疑问句（附加在句末使句子变成疑问句，如isn't it?或did you?）
questionablequestionable
/ˈkwestʃənəbl ||; ˈkwɛstʃənəbḷ/adj
1 that you have doubts about; not certain 有问题的；不肯定的；不确定的: It's questionable whether we'll be able to finish in time.我们是否能如期完成还是个问题。
2 likely to be dishonest or morally wrong （诚信或道德上）可疑的，值得怀疑的: questionable motives可疑的动机 [OPP] unquestionable 反义词为unquestionable