回复: 建议
Sorry, i have no idea but i searched in google and i got a list and that was below. I don't know how it will be helpful
Aijmer, Karin (1986): Discourse variation and hedging. In: Aarts, Jan & Meijs, Willem (eds), 1-18.
Aijmer, Karin (1996): Conversational routines in English...