This document discusses a study on the role of teachers in teaching physics in English (L3) using the CLIL (Content and Language Integrated Learning) methodology at a private school in Kazakhstan. The study involved 101 grade 11 physics students and surveys and interviews with teachers and graduates. The findings showed that both teachers and students need to improve their English abilities. Teachers recognized the need to change methods from L1 (Kazakh) to L3 (English). The main challenges for teachers are developing language and content competencies along with appropriate CLIL teaching practices and materials. Recommendations include improving teacher English, using multiple teaching models, developing trust, and limiting use of the mother tongue.