This study explored the order of acquisition of various types of syntactic-movement and embedding structures in Hebrew, using a sentence-repetition task, in which 60 children aged 2;2-3;10 repeated 80 sentences (with a total of 4800 sentences), and an analysis of the spontaneous speech of 61 children aged 1;6-6;1 (27,696 clauses). The sentence repetition task revealed a set order of acquisition of the various types of syntactic movement: A-movement is acquired first, then A-bar-movement, and finally movement of the verb to C. The analysis of spontaneous speech revealed the same order: A-movement of the object of unaccusative verbs to subject position appears first, together with simple SV sentences; then, wh-questions appear, then relative clauses and topicalization, which appear together with embedding of finite clauses, and lastly, V-to-C movement. Previous studies have shown that Hebrew speakers under age six have difficulty comprehending and producing sentences with A-bar-movement in which a lexically-restricted object crosses over a lexically-restricted subject. And indeed, whereas children produced A-bar structures very early (wh-questions from age 1;6, relative-clauses and topicalization from age 2;6), until age 5;8 these structures never included a lexical DP crossing over another lexical DP. Both tasks indicated that the order of structure acquisition is fixed, creating Guttman scales between structures, but different children acquire the same structure at very different ages. It seems that whereas the syntactic path and the stages of structure acquisition along it are constant between children, each child walks this path in their own pace.

This paper addresses the question of the existence and manifestation of Root Infinitives (RIs) in the acquisition of a creole language, Jamaican Creole (JC). It examines JC children’s omission of progressive and prospective aspectual markers in the clausal map in order to determine if early JC includes a root infinitive (RI) stage. Non-target-consistent bare verb structures in child JC are shown to have distributional properties which have been claimed to be hallmarks of RIs: in particular, they occur in declaratives (and in yes-no questions), but not in wh-questions, and they typically co-occur with null subjects, whereas overt subjects are required in clauses with fully specified aspectual markers. We argue that these properties are expected under a truncation approach (Rizzi 1993/4; De Lisser et al. 2016), rather than other approaches to RI. Additionally, truncation is compared to the “growing trees” approach introduced in Friedmann, Belletti and Rizzi (this volume), according to which learners’ productions start with minimal structures in a bottom up fashion, and then higher zones get added on top of the structure as development proceeds, following the hierarchical organization uncovered by cartographic work. We conclude that these approaches are compatible, and possibly reflect different stages in language development.

The aim of this paper is twofold: first, we intend to contribute to the debate on the identification of the features to which syntactic locality expressed in terms of the featural Relativized Minimality/ fRM principle appears to be sensitive (Rizzi 2004; Friedmann, Belletti & Rizzi 2009); second, we aim at providing a better characterization of the distributional and interpretive properties of the process of a-marking in the Topic position of the Italian left periphery identified by syntactic cartography, in relation to (in)animacy (Belletti & Manetti 2019).To these ends, we examined the role of animacy in a production experiment eliciting left dislocated topics with 5-year-old Italian-speaking children. To the extent that a-marking is related to a kind of affectedness of object topics (Belletti 2018a), we examined whether an inanimate left dislocated object could constitute a felicitous a-Topic. Furthermore, the question is directly addressed whether complexity effects in fRM configurations can be modulated in the animacy mismatch condition, with an inanimate left dislocated object and an intervening (animate) lexical subject in ClLDs. Our results show that, in the tested animacy mismatch condition, children seldom a-marked the pre-posed object. Instead, they appeared to creatively explore other solutions to overcome the production of the hard intervention structure, mainly using null subjects. As children are not ready to compute the intervention configuration with a lexical preverbal subject, but could not naturally adjust it through a-marking of the inanimate topic, they ended up opting for different types of productions in which intervention was eliminated. If the animacy feature seems to be implicated in the process of a-marking to some extent, it is not a feature to which the fRM principle is sensitive in building the object A’-dependency in ClLD: we conclude, in line with previous work, that animacy is not among the features implicated in triggering syntactic movement (in Italian).

Children’s difficulties with dependencies involving movement of an object to the left periphery of the clause (object relative clauses/RCs and wh-questions), have been explained in terms of intervention effects arising when the moved object and the intervening subject share a lexical N feature (Friedmann, Belletti & Rizzi 2009). Such an account raises various questions: (1) Do these effects hold in the absence of a lexical N feature when the object and the intervener share other relevant features? (2) Do phi-features with a semantic role modulate such effects? (3) Does the degree of feature overlap determine a gradience in performance? We addressed these in three sentence-picture matching studies with French-speaking children (4;8 to 6;3), by assessing comprehension of (1) subject and object RCs headed by the demonstrative pronouns celui/celle and matching or mismatching in number; (2) object RCs headed by a lexical N and matching or mismatching in animacy; (3) object who- and which-questions. Our results show that mismatches in number, not in animacy, enhance comprehension of object RCs, even in the absence of a lexical N feature, and confirm previous findings that object who-questions yield better comprehension than object which-questions. Comparing across studies, the following gradation emerges with respect to performance accuracy: disjunction > intersection > inclusion. The global interpretation of these findings is that fine-grained phi-features determining movement are both sufficient and necessary for locality, and the degree of overlap of these features can capture the pattern of performance observed in children, namely higher accuracy as featural differences increase.