AbstractThe syntax of auxiliaries has given rise to much discussion in the generative literature (Akmajian and Wasow 1975; Emonds 1978; Akmajian et al. 1979; Pollock 1989; Chomsky 1993; Lasnik 1995b; Roberts 1998; Bjorkman 2011; Rouveret 2012). This paper explores the distribution of non-finite auxiliaries in Standard English, in particular the issue as to whether such auxiliaries raise for inflectional purposes or remain in their base positions and have their inflections lowered onto them.It is shown that auxiliary distribution is not determined by auxiliary type (passive, copular, progressive etc.) as the lowering accounts predict, but by the morphological form that the auxiliary takes. In particular, the auxiliaries