 Moreover, various authors before the fourteenth century, and at least one fourteenth century author too (namely, Vincent Ferrer) differed a little from what has been said in not attributing supposition to predicate terms, calling the corresponding property of predicates, “copulation”. However, even in the early thirteenth century, this distinction was fading. William of Sherwood makes it clearly: substantive names and pronouns supposit, whereas adjectives, participles and verbs copulate – all those terms which are attributed to something by means of the copula ‘is’. Only the modes of common personal supposition are repeated for copulation: “every copulating word signifies in adjunction to a substantive and thus is copulated personally … [and] every copulating word is the name of an accident, but every name of an accident is common; therefore no copulation is discrete” (Sherwood, tr. Kretzmann, p.  121).[29]  However, even in Lambert and Peter of Spain, there is only an empty nod towards copulation. Lambert notes that properly speaking, supposition attaches to substantives, while copulation is appropriate for adjectival terms. But broadly speaking, he says, supposition belongs to both (ed. Alessio, p. 208; tr. Maloney, p. 258). The distinction is clearly unnecessary and useless, and although the term is preserved in, e.g., Walter Burley's De Puritate, his discussion headed ‘On Copulation’ is in fact a discussion of the uses of the copula, ‘est’.