Ways of identifying subjectification and especially intersubjectification are discussed using data from the history of English no doubt and surely. These adverbs arose out of non-modal expressions and were recruited for use as epistemic adverbs and metadiscursive markers. The data are shown not to support the hypothesis that expressions at left periphery are likely to be subjective (oriented toward turn-taking and discourse coherence), those at right periphery intersubjective (oriented toward turn-giving or elicitation of response, and toward the Addressee’s stance and participation in the communicative situation.). While no doubt is subjective at both left and right periphery, surely is intersubjective at both peripheries