“…), is often characterised by non-linearities, spurts and reversals in development etc., and its outcome is impossible to predict (e.g., De Houwer, 2009;Kupisch & Rothman, 2016;Pascual y Cabo & Rothman, 2012;Scontras, Fuchs & Polinksy, 2015). Of particular relevance here is the observation that, despite the fact that such early bilinguals or Heritage Speakers (HSs) are exposed to their home language from birth, as adolescents or adults many of them 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 share more characteristics with adult L2 learners than with monolinguals (e.g., Montrul, Davidson, de la Fuente & Foote, 2014). They often fail to establish target-like representations of grammatical categories, even if they had been exposed solely or largely to the home language up to and beyond the age at which these categories are typically mastered in monolingual L1 acquisition (e.g., Cuza & PerezTattam, 2016; Karayayla, forthc.…”