1. Syntactic Gradience. The Nature of Grammatical Indeterminacy;Aarts,2007
2. It's a myth, innit? Politeness and the English tag questions;Algeo,1990
3. Are tag questions? Evidence from spoken data;Andersen,1998
4. Tag Questions in Fiction Dialogue;Axelsson,2011
5. English tag questions and intonation;Bald,1979