The article focuses on the evidentiality of hang(吭)yes-no questions,including information sources,certainty and the relationship between the two.Hang(吭)yes-no questions express unrealistic speculation.The information mainly comes from indirect evidence,which is the speaker's opinion after inference or other people's retelling.The degree of certainty of hang yes-no questions are relatively high,and belief is greater than doubt.And the sequence level of certainty is hang(吭)yes-no questions＞ba yes-no questions＞ma yes-no questions＞a yes-no questions＞declarative questions.The source of information for yes-no questions is not necessarily related to the degree of certainty,and the context is also an important factor affecting its evidence.It is mainly manifested in the fact that the specific source of information for yes-no questions needs to be determined in the context.In special contexts,the yes-no questions can also express doubts,with a very high degree of certainty.
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