“…For example, Clark (1978) argued, based on single-case diaries and some observational data, that demonstratives are generally among the first 50 words English-speaking children use and that that and there are very frequent during the one-word stage. However, several later word-learning studies, using parental questionnaires, raised doubts about Clark’s hypotheses (Caselli, Bates, Casadio, Fenson, Sanderl, & Weir, 1995; Fenson, Dale, Reznick, Bates, Thal, Pethick, Tomasello, Mervis, & Stiles, 1994; González-Peña et al, 2020). In particular, González-Peña et al (2020) argued that demonstratives appear much later than Clark and others claimed.…”