L1 transfer errors are not random — they are systematic patterns that follow directly from how the learner's first language works. Select a source language to explore documented interference categories, triage a student error, and test your knowledge with a quick quiz. For ESL/EFL teachers and teacher-trainers.
Click any category to expand the full explanation, error examples, and teaching tip. Categories are ordered by frequency of occurrence in learner corpora.
Test your knowledge of Mandarin–English interference patterns. Select the best answer for each question.