Finding out efficient ways for grammar teaching in second language learning has always been a great concern. Therefore, in this study, the benefits of teaching grammar through communicative approach and audio-lingual method are discussed in terms of their effects on the proficiency levels of target language learners. This study was carried out through classroom observations by participating in two classrooms in a private high school in Turkey. Sixteen students in both classes of all whom were ninth grade were observed. Although they were ninth grade students, their linguistic levels were different: ten elementary students and six intermediate level students. For the elementary level students, grammar teaching was implemented through audio-lingual method, while communicative teaching was applied for the intermediate level students. Data collection was accomplished through observation and interview reports. General findings of this research displayed that applying communicative approach and audio-lingual method in grammar teaching resulted in promising conclusions at different linguistic levels.