“…Even before they have a fully developed Theory of Mind, three-year-olds are already at least partly sensitive to the same constraints that regulate referential choice in adult speakers (see Allen, Hughes & Skarabela, 2015, for a review). Pre-school children are more likely to omit arguments, or use reduced expressions, when they are part of the common ground either through joint attention (Skarabela, 2007), previous linguistic mention (Allen & Schröder, 2003; Clancy, 2003; Guerriero, Oshima-Takane & Kuriyama, 2006; Stephens, 2015), or prior mention and/or perceptual availability (Campbell, Brooks & Tomasello, 2000; De Cat, 2011; Matthews, Lieven, Theakston & Tomasello, 2006; Rozendaal & Baker, 2010; Salazar Orvig, Marcos, Morgensterns, Hassan, Leber-Marin & Parès, 2010a; Salazar Orvig, Marcos, Morgensterns, Hassan, Leber-Marin & Parès, 2010b).…”