This document discusses a study that examined whether the poor English proficiency of English second language (ESL) teacher students affected the progress of ESL learners during support lessons. The study analyzed errors in portfolios of teacher students enrolled in an Advanced Certificate in Education program at the University of South Africa. The results showed similarities between the errors of teacher students and learners, suggesting the teachers' limited English skills may have negatively impacted learners' English acquisition. However, the document notes other factors could also influence learners and more research is needed.