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In this article we examine language processing and development in Catalan or Spanish-speaking children with SLI, focusing on the study of the verb. We analyse the key initial phase of its process of acquisition and aim to define common features of the SLI group that distinguish them from children with normal language development. We intend to identify more precisely the kind of delay shown by these children in a language with a rich verb morphology, in terms of both structure and chronology. The sample comprised 18 Catalan-Spanish bilingual pre-school children, assigned to three groups of six; an SLI group and two control groups, one matched for age and the other matched for MLU-w. Developmental data were obtained by recording situations of spontaneous speech at two different time points. Certain differences were found between groups in verb production. Production of verb inflection by children with SLI was only partial at the first evaluation; they maintained the same percentage of errors after a year. The patterns of correct and incorrect verb forms found in Catalan and Spanish do not corroborate the EOI hypothesis, but they support the Surface Hypothesis, given that the number of errors is not particularly high. This suggests the presence of limitations in subjects' processing ability, linked to the typological characteristics of the specific language being learnt. (Contains 13 tables and 7 notes.)