| Sumario: | Introduction: It is well documented that preschoolers with DLD produce first instances of sentential complement clause sentences later than same‐age peers with typical language. However, it remains unknown whether children with DLD are limited in their production of a variety of sentential complement clause sentences. Aims: Using a sentence imitation task, we investigated whether preschoolers with DLD present with deficits in the production of sentential complement clause sentences with matrix clauses that are semantically and syntactically varied. We contrasted these sentences with sentential complement clause sentences that contain matrix clauses that are semantically and syntactically limited. We refer to these matrix clauses as true matrix clauses and formulaic matrix clauses, respectively. Methods and Procedures: Twenty‐eight 5‐year‐old children (DLD, n = 14) participated in this study. The experimental task was a 50‐item sentence imitation task. Five complement clause verbs (CCVs)—think, know, guess, bet, remember—were used in sentential complement clause sentences containing either formulaic matrix clauses or true matrix clauses. Outcomes and Results: Although children with DLD presented with lower proficiency in all sentential complement clause sentences, children with DLD did not show significantly greater difficulty with sentences containing true matrix clauses than sentences containing formulaic matrix clauses. Conclusions and Implications: Sentential complement clause sentences pose a significant challenge for children with DLD. WHAT THIS PAPER ADDS: What is already known on this subjectPrevious research reveals that children with DLD present with deficits in imitating later‐developing complex syntax constructions, such as relative clause sentences containing multiple propositions. It is unknown whether these deficits extend to other complex syntax types containing multiple propositions, such as sentential complement clause sentences.What this paper addsOur study found that children with DLD did not present with salient deficits in sentential complement clause sentences containing multiple propositions. However, children with DLD may present with deficits in the production of a variety of sentential complement clause sentences.What are the clinical implications of this study?Our findings suggest that children with DLD struggle with all sentential complement clause sentence types. We discuss the importance of selecting appropriate complex syntax structures when planning complex syntax intervention.
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