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I discuss three issues common to papers in the present issue of CatJL by Aijmer, Bazzanella et al., and Waltereit and Detges. One is modal uses of discourse markers and distinctions between discourse markers and modal particles. The second is evidence provided by the papers for diachronic changes that individual markers underwent; the distinction between grammaticalization and pragmaticalization is considered and challenged. Finally, I raise some issues regarding the methodology of data-selection in contrastive studies.
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Elizabeth Closs Traugott (2007) studied this question.
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