Abstract Clitic placement with European Portuguese uninflected verbs is problematic for prosodic analyses. While ‘proclisis triggers’ give rise to obligatory proclisis with inflected verbs, they often lead to optional proclisis/enclisis with uninflected verbs ( Raposo or (b) the verb raises through T to Fin (resulting in enclisis); but not both (building on Fernández-Rubiera 2009 , 2010 ). The special behaviour of uninflected infinitives can be explained by the possibility of clitics attaching to a lower verbal host and then moving with that host to T resulting in enclisis ( Raposo and Uriagereka 2008 ). Aspectual/quantificational heads block verb movement to T, ruling out enclisis via ‘low fusion’.
Michelle Sheehan (Mon,) studied this question.