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Article published In:
ITL - International Journal of Applied Linguistics
Vol. 172:2 (2021) ► pp.229–258

How well do learners know derived words in a second language?

The effect of proficiency, word frequency and type of affix

ORCID logo | University of Haifa
| University of Western Ontario
| University of Western Ontario
| Shaanan College of Education

The study investigates derivational knowledge of second language (L2) learners as a function of four variables: learner proficiency, word family frequency, derived word frequency, and affix type as suggested by two affix difficulty hierarchies. Seventy-nine EFL learners at two proficiency levels received two tests, the VST – Vocabulary Size Test (Nation & Beglar, 2007) and a custom-made ‘Derivatives Test’, which included derived forms of VST base words. We performed the following within-participant comparisons: knowledge of base words and knowledge of their derived forms, knowledge of derived forms from high-, medium, and low-frequency word families and knowledge of derivatives at different affix difficulty levels. Knowledge of basewords and their derivatives was statistically equivalent for advanced learners. However, a difference was found between the categories for less advanced learners. The findings also revealed learner proficiency and base word frequency effects, partial support for the two affix difficulty hierarchies, and no support for the effect of derivative frequency.

Keywords: derived words, derivational knowledge, word families, affix difficulty, word frequency, L2 vocabulary size
Article outline
  • Introduction
  • Background
    • Research investigating receptive knowledge of derived forms
    • Factors that may affect knowledge of derived forms
    • Hierarchies of affix knowledge
  • The study
  • Method
    • Participants
    • Data collection instruments
      • Vocabulary size test (VST)
      • Derived words test (DWT)
      • Frequency of derived words
      • Classification of derived words by word family frequency
      • Hierarchies of affix difficulties
    • Data analysis
  • Results
  • Discussion
  • Conclusion
  • Notes
  • References
Published online: 25 January 2021
DOI logo
https://doi.org/10.1075/itl.20020.lau
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