As one type of the most extensively used sentences, English questions are must-learn grammatical structures for learners of English as a foreign language (EFL). However, it is commonly seen that English learners across proficiency levels produce ungrammatical English questions. To determine the source of learners' erroneous production, we…

This article reports on a study investigating the second language (L2) acquisition of the plural and human features in Mandarin Chinese by adult Korean speakers. Both plural and human features are represented in Korean and Chinese, but assembled in different ways. Forty-eight L2 learners at beginner, intermediate, and advanced Chinese proficiency…