“…Among those published reports that do provide this information, a consistent pattern has been observed. In studies with children as young as age 3 years ( BarShalom, Crain & Shankweiler, 1993;McDaniel, McKee, & Bernstein, 1998;McKee & McDaniel, 2001), rates of production of subject gap (SG) relative clauses (e.g., the elephant that is flying) are very high (75Á100%) in trials designed to elicit these structures. By comparison, rates of production of object gap (OG) relative clauses (e.g., the one who the boy is kissing) are consistently lower (no higher than 55%) in trials designed to elicit these structures, and some children fail to produce any OG relative clauses at all in a testing session.…”