ABSTRACT Annafi’, Salma. (2024). Developing an English Supplementary Book for Civil Engineering Students at Universitas Tidar. Undergraduate Thesis. English Education Department. Faculty of Education and Teacher Training, Universitas Tidar. Advisor I Boris Ramadhika, M.Pd, Advisor II Rini Estyowati Ikaningrum, M.Pd. Keywords: Supplementary book, speaking skills, English for Spesific …