“不错3”是一个话语标记,具有衔接功能,其辖域包括前段和后段,而且后段中必须包含两个语义上存在转折关系的语段。“不错”标示论证结构,其前段是论题,后段是论证部分,具有语用中“类反证”指示功能。“不错”出现的语境变化是其虚化的重要条件,在不同语境中句法功能、语义特征以及承载的信息量等发生变化是主要动因。 “Not bad 3 ” is a discourse marker with cohesive function. Its scope includes the front and back segments, and the back segment must contain two segments that have semantic relations. “Good ” marked the structure of argument, the preceding paragraph is the subject, the latter part of the argument, with pragmatic “class proof ” indicating function. “Good ” appeared contextual changes is an important condition of its virtual, in different contexts syntactic functions, semantic features and the amount of information carried by the change is the main cause.