The presence of non-adult patterns of omission/production of functional categories has occupied a central place in both monolingual and bilingual child language acquisition research. In bilingual acquisition a central learnability issue has been to determine whether interlinguistic influence would interact with those patterns. In this article, the authors analyse the omission/production of subject pronouns in the developing Spanish grammar and of copula be in the developing English grammar of two EnglishSpanish simultaneous bilingual children in order to address the issues of the locus and directionality of interlinguistic influence. The authors argue that the directionality of interlinguistic influence is determined by the need to implement core operations of the computational system and that the lexical-semantic interface is an area of the grammar where interlinguistic influence occurs.

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In foreign language classrooms we often find that, in addition to their mother tongue (L1), learners already speak – or are learning – at least one other language. As a result, they already have an array of linguistic and cognitive skills that may prove very useful if they are adequately exploited during the language learning process. However, in contrast with the growing interest displayed by researchers in the processes involved in the acquisition of a third or subsequent language (e.g.

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