The Romance future and conditional tenses are the result of the grammaticalization of the Latin periphrasis CANTĀRE HABEŌ. In medieval Catalan, the synthetic forms, with proclitic (el faré) or enclitic (faré-lo) pronouns, coexisted with the analytical ones, that presented mesoclisis (fer-lo he). These forms were distributed according to the medieval syntax of weak pronouns (Batllori et al., 2005). Analytical forms do not present univerbation (cf. Lehmann, 1985) and are thus less grammaticalized. In this article, the grammaticalization of these tenses is observed from the occurrences of Vides de sants rosselloneses, written in the 13th century. The results, compared with Spanish (cf. Bouzouita, 2016a) and Navarroaragonese (cf. Primerano, 2019), support the hypothesis of the diatopic diffusion of the grammaticalization process, according to which the grammaticalization is more advanced in the eastern languages of the Iberian Peninsula than in the western languages (Bouzouita & Sentí, 2022).
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