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Children conservatively produce syntactic patterns on a verb-by-verb basis (Akhtar and Tomasello, 1997;Baker, 1979; Bates and MacWhinney, 1987; Bowerman, 1982; Braine, 1976; Brooks and Tomasello, 1999;Gropen et al., 1989; Ingram and Thompson, 1996; Lieven