Wald,B.1983.Referents and topic within and across discourse units:Observations from current vernacular English.In F.Klein-Andreu,ed.,Discourse Perspectives on Syntax.91-116.New York:Academic Press.

• "副主题"是仿照"副动词"这一术语而创造的.；也就是说；我们并不认为副主题本身完全具有资格成为主题；虽然它们可能不同程度地具有某些主题的属性