| Summary: | The study examines how prototypes and typological relationships between the L1, the L2 and the target language (TL) interact with TL proficiency in learning Italian as additional language. Low-proficiency and high-proficiency undergraduate learners of Italian (N = 25) with Swedish as L1 performed an oral retelling story test, aiming to elicit the Italian aspectual contrast perfective-imperfective. Their tense selection was analyzed considering the predicates’ lexical aspect and the learners’ knowledge of a Romance L2, or lack thereof. The findings show that the typological proximity between the L2 and the TL exerts a differential role depending on TL proficiency. Initially, it is beneficial for accelerating the overall emergence of the <i>imperfetto</i> as an aspectual marker. However, the prototype factor and, more specifically, the predicates’ dynamicity influences the selection of past inflectional morphology. At more advanced stages, knowledge of a Romance language helps learners move beyond prototypical associations with the <i>passato prossimo</i>, but it does not seem to influence the use of the <i>imperfetto</i> among high-proficiency learners. These results are discussed in the light of research on the second and additional language learning of aspectual contrasts in Romance languages.
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