This study compared the effect of productivity (a correlate of suffix frequency) on derivational suffix use in 69 elementary and middle school students' derivational suffix use. Twenty-three students had language-learning disabilities (LLD). Students with and without LLD used highly productive suffixes but LLD students were less accurate in…

English-as-a-Second-Language students in Japan were tested at the beginning and the end of the school year to examine changes in word associations and grammatical suffix knowledge. Results showed an average vocabulary gain of 330 words, a poor knowledge of the allowable suffixes for the verbs learned, and 19 to 25 percentage points more receptive…