“…Thus far, comprehension studies of natural language support the latter view, that is, children's reliance on only one form rather than two in language production is mirrored by their comprehension of one form, but not the other (e.g., Davies et al, 2019;Miller, 2014). For example, Miller and Schmitt (2012) found that children acquiring varieties of Spanish where /-s/ is variably omitted took longer to associate plural /-s/ to a more-than-one interpretation in comprehension as compared to children acquiring dialects of Spanish in which the plural marker is more consistently produced (see also Lukyanenko & Miller, 2019;Miller, 2007Miller, , 2014. Similarly, children acquiring African American English tend not only to omit third person singular -s (e.g., Newkirk-Turner & Green, 2016), but also do not comprehend it (De Villiers & Johnson, 2007).…”