Differential effects of EFL proficiency and mode on noun phrase use

Abstract

This study extends the existing research on phrasal elaboration by investigating the independent and interactive effects of English as a foreign language (EFL) proficiency and mode (speaking and writing) on the overall and individual use of five distinct types of noun phrase modifiers. These modifiers include premodifiers, prepositional phrases, non-finite verb phrases, relative clauses, and nominal clauses. A total of 7676 second-year English majors were instructed to produce both oral and written argumentative essays on the same topic. Robust ANOVAs showed that EFL proficiency exhibited neither a significant main effect nor a significant interaction with mode with regard to the overall use of noun phrase modifiers or the specific use of premodifiers and prepositional phrases. However, a significant effect of mode was detected for different EFL proficiency levels. Mode did not yield a significant effect, whilst EFL proficiency demonstrated a significant impact on the use of non-finite verb phrases. No significant main effects or interactions were observed for EFL proficiency and mode in terms of the use of relative clauses or nominal clauses. These findings suggest the pedagogical need to prioritize the learners’ procedural knowledge of noun phrases, with specific attention to the nuances of EFL speaking versus writing.