“…Control over the feature requires knowledge of both the irregular and regular forms, but systematic use of the irregular past (did, said, went) tends to occur before productive use of the regular past (Lee, 2001;Rohde, 1996). At least some of the difficulty derives from the lack of perceptual salience of the regular form of the simple past (Bell, Trofimovich, & Collins, in press;McDonald & Roussel, 2010; see also Bayley, 1996;Goad, White, & Steele, 2003;Wolfram, 1985). In addition, learners initially make much more frequent use of the simple past with the class of verbs known as telics (finished, made something), which are bounded events with inherent end points.…”