SummaryThis paper is dealing with particles such as at, autem, nain, sed. uero. operating in poetical context. These words have been previously described by Kroon 1995 in terms of ‘functional grammar’, so we use her work as a framework for our own insight in Catullus’poem, focusing on the rhythmical moves that particles contribute to provide. Often accounted as clitics, our particles may in fact be stressed by a discourse emphasis. Kroon’s description proves to be sound, even in poetical context, but, according to us, remains, somehow, too abstract, inasmuch as it does not explain the oral dimension of discourse organization.