Some Key The seventh grade students who were exposed to grammar-free written and oral sentence-combining practice showed evidence of a level of syntactic maturity well beyond that typical of eighth graders and in many respects similar to that of twelfth graders. In words per T-unit, the most reliable measure of syntactic maturity, they experienced approximately twenty time normal growth. These students wrote compositions that were judged to be significantly better in overall quality than those written by students in the control group.