Commentary
Why are some aspects of language acquired earlier than others?
References (11)
References
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Tsimpli, I.M. (this volume). Early, late or very late? Timing acquisition and bilingualism. Linguistic Approaches to Bilingualism. 
Unsworth, S. (2013). Assessing the role of current and cumulative exposure in simultaneous bilingual acquisition: The case of Dutch gender. Bilingualism: Language and Cognition, 161, 86–110. 
