“…Historically, researchers have primarily focused on the development of other open word classes such as nouns and verbs (see He & Arunachalam, 2017, for a review). Although more attention has been devoted to adjective processing and development in recent years (e.g., Arunachalam, 2016;Blackwell, 2005;Fernald et al, 2010;Huang & Snedeker, 2013;2000;Murphy & Jones, 2008;Ninio, 2004;Ramscar Yarlett, Dye, Denny, & Thorpe, 2010;Ricks & Alt, 2016;Sandhofer & Smith, 2007;Sekerina & Trueswell, 2012;Syrett, Kennedy, & Lidz, 2010;Thorpe & Fernald, 2006;Tribushinina, 2009Tribushinina, , 2011aTribushinina, , 2011bTribushinina, , 2012Tribushinina, , 2013aTribushinina et al, 2013Tribushinina et al, , 2014Tribushinina & Mak, 2016;Tribushinina, Mak, Dubinkina, & Mak, 2018), more research is needed to further the understanding of how adjectives occur in the input and how their various forms are processed. This is vital for fully understanding the challenges they bring.…”