Developing the skill to form derivatives is a slow incremental process even for native speakers of English, starting in elementary school and continuing through high school. In fact, it appears to be a universally challenging area of the lexicon. Nevertheless, studies have shown that it is one of the most important skills to possess for a learner…

Two experiments with 40 children (grades 4 to 8) found the children often used their knowledge of derivational suffixes in defining low-frequency derivatives, and knowledge of suffixes was significantly correlated with suffix production in a nonsense task. The children's morphological awareness of derivational suffixes included semantic…

English as a Foreign Language (EFL) freshman students at the College of Languages and Translation received direct instruction in adjective-forming suffixes, then they took an immediate and a delayed test. Error analysis showed that 36% of the responses were left blank or the subjects duplicated the stimulus word. In 32% they mismatched the word…

Knowledge of derivational suffix meanings was investigated in 10 subjects (ages 10-12) with language learning disabilities and typical peers. Students produced derived forms from nonce bases in an elicitation task and selected derived forms in a forced choice task. Elicitation task accuracy of subjects fell substantially below that of peers.…

Relational knowledge of 21 derivational suffixes was investigated with 120 children (grades 3-8) and 40 adults. Results obtained from a nonsense-word model indicated that suffixes were comprehended with greater accuracy than they were produced, particularly by the children. Children and adults demonstrated greatest accuracy in comprehension and…

A study measured and compared the semantic and syntactic knowledge of 20 sixth-grade students with reading disabilities, 20 fourth-grade typical readers, and 20 sixth-grade typical readers. Results indicate that students with reading disabilities were better able to demonstrate knowledge of suffixed words in oral language measures than in reading…

Knowledge of derivational morphology can aid readers in the analysis and acquisition of new vocabulary, in lexical access, and in establishing the syntactic structure of sentences. A study investigated good and poor readers' knowledge and use of derivational suffixes in establishing sentence level syntax. Subjects, 123 10th and 11th grade…