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Published online by Cambridge University Press: 28 November 2008
Development of plural and past tense morphological rules was examined longitudinally with 272 English-speaking children enrolled in French immersion or traditional English curricula. Children were tested in grades one through four on 18 items from Berko's test (1958). There were no performance differences between the two curriculum groups, girls performed better than boys, and there were correlations between intelligence and performance. Syllables requiring the plural /-z/ and past tense /-d/ and /-t/ were acquired earlier than those calling for /-∂z/ or /-∂d/. Inflection acquisition was orderly and sequential within subjects. By age 10 children began using adultlike irregular formations, but regular or overregularized forms preceded irregulars. Whereas basic rules were mastered by 10 years, more difficult forms were still developing.