1. I think – an English modal particle;Aijmer,1997
2. I think and I don’t know in English as lingua franca and native English discourse;Baumgarten;J. Pragmat.,2010
3. Praat: Doing Phonetics by Computer [Computer Program]. Version 6.0.21;Boersma,2016
4. What makes a word contrastive? Prosodic, semantic and pragmatic perspectives;Calhoun,2007
5. “I Reckon I Know how Leonardo Da Vinci Must Have Felt…” Epistemicity, Evidentiality and English Verbs of Cognitive Attitude;Cappelli,2007