“…Most previous work relies on phonetic or phonological features (Kretzschmar, 1992(Kretzschmar, , 1996Heeringa, 2004;Labov et al, 2005;Nerbonne, 2006Nerbonne, , 2009Grieve et al, 2011Grieve et al, , 2013Nerbonne, 2011, 2015;Grieve, 2013;Nerbonne and Kretzschmar, 2013;Kretzschmar et al, 2014;Kruger and van Rooy, 2018) for the simple reason that phonetic representations are relatively straight-forward: a vowel is a vowel and the measurements are the same across varieties and languages. Previous work on syntactic variation has focused on either (i) an incomplete set of language-specific variants, ranging from only a few features to hundreds (Sanders, 2007(Sanders, , 2010Szmrecsanyi, 2009Szmrecsanyi, , 2013Szmrecsanyi, , 2014Grieve, 2011Grieve, , 2012Grieve, , 2016Collins, 2012;Schilk and Schaub, 2016;Szmrecsanyi et al, 2016;Calle-Martin and Romero-Barranco, 2017;Grafmiller and Szmrecsanyi, 2018;Tamaredo, 2018) or (ii) language-independent representations such as function words (Argamon and Koppel, 2013) or sequences of part-of-speech labels (Hirst and Feiguina, 2007;Kroon et al, 2018). This forces a choice between either an ad hoc and incomplete syntactic representation or a reproducible but indirect syntactic representation.…”