“…The most recent study (Hao et al, 2021) found a significant gap between comprehension and production accuracy of classifiers in Mandarin-speaking children, corroborating the findings of previous studies (Chien et al, 2003;Uchida & Imai, 1999) that comprehension precedes production in classifier acquisition. Among those studies that examine comprehension of classifiers, children seem to reach ceiling (over 90% accuracy) on various types of sortal classifiers by age six, with significant improvements between four to five years of age (Japanese: Uchida & Imai, 1996, 1999Sumiya & Colunga, 2006;Yamamoto & Keil, 2000, Chinese: Chien at al., 2003Li et al, 2010;Hao et al, 2021). On the other hand, those that test the production of classifiers show strikingly low accuracy for six-year-old Chinese and Japanese children (Hao et al, 2021;Matsumoto, 1987;Uchida & Imai, 1999) and a study with Malay children (Salehuddin & Winskel, 2009) shows that even children as old as nine could only produce the correct classifier around 50 percent of the time.…”