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A number of recent studies have argued that bilingual children's language comprehension and production may be affected by cross-linguistic influence. The overall aim of this study was to investigate whether the ability to judge the grammaticality of a construction in one language is affected by knowledge of the corresponding construction in the other language. We investigated how English–Italian and Spanish–Italian bilingual children and monolingual peers judged the grammaticality of plural NPs in specific and generic contexts in English and in Italian. We also explored whether language of the community, age, and the typological relatedness of the bilinguals’ two languages significantly affected their performance. While performance in English was overall poor, no significant differences existed between the English–Italian bilinguals and the monolinguals. In contrast, we found that knowledge of English affected the bilinguals’ ability to discriminate between grammatical and ungrammatical sentences in Italian. The English–Italian bilinguals were significantly less accurate than both the monolinguals and the Spanish–Italian bilinguals in a task where they simply had to rely on the local definite article cue to reject ungrammatical bare plurals in generic contexts. Language of the community and age also played a significant role in children's accuracy.

This study investigated the role of typological relatedness, language of the community, and age, in predicting similarities and differences between English–Italian, Spanish–Italian bilingual children and their monolingual child and adult counterparts in the acceptability of pre- and postverbal object pronouns in [±focus] contexts in Italian and in English. Cross-linguistic influence occurred in [−focus] contexts as a function of typological relatedness and language of the community. English–Italian bilinguals in the UK accepted pragmatically inappropriate postverbal pronouns in [−focus] contexts in Italian twice as often as all the other groups. Cross-linguistic influence was unidirectional from English to Italian as shown by the categorical rejection of preverbal pronouns in [−focus] contexts in English. In [+focus] contexts, in English no significant differences existed between the monolinguals and the bilinguals in the low accuracy with which they chose pragmatically appropriate stressed pronouns. Similarly, the choice of appropriate pronouns in [+focus] contexts in Italian was problematic for monolingual and bilingual children irrespective of the language of the community and of the bilinguals’ other language. Age was a factor only for the Italian children who approached adultlike performance in [+focus] contexts only by the age of 10. These findings point to the need for a multifaceted approach to account for similarities and differences between the linguistic behavior of bilingual and monolingual children.

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Over the last few decades, the migratory phenomenon, supported by social, economic, and political aspects, has become progressively intensified and structured, increasing its relevance as a topic of interest for researchers of various disciplines and, among these, occupational health and safety exerts a prominent role [...]