The purposes of this study are to investigate the competences of English teachers in Thailand and propose the teaching competence enhancement approach to meet the needs of 21st century English teachers for STEM track school. The documentary study was used as methodology in this study. The findings of this study demonstrated that the activity-based teaching allows students to practice communication skills effectively. Furthermore, English teacher’s competences to develop students’ English learning can be implemented by using five-step communicative teaching approach, including warm up, presentation, practice, production, and wrap up.
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