话语标记“我是说”在独自语篇中具有逻辑连接功能和主观情态功能,逻辑连接功能包括对比功能和解注功能,主观情态功能包括强调功能、补充功能、修正功能和缓延功能。“我是说”在对话语篇中具有解释功能、纠正功能和接续功能。“我是说”是从跨层结构发展为话语标记的,具体表现为从话语到内容,从言说到认知,其演变动因是交互主观化。 Discourse markers “I mean ” has logical connection and subjective modalities in solitary discourse. The logical connection includes comparison and annotation. Subjective modalities include emphasis, supplementation, correction and delaying. “I mean ” in the dialogue discourse with interpretation, correction and continuity features. “I mean ” is the development of cross-layer structure of discourse markers, specifically from the discourse to content, from the speech to the cognitive, the evolution of the motivation is interactive subjective.