Currently, English is one of the most widely spoken languages across the globe. Grammar is a salient aspect of language learning. Reports from recognized magazines such as Forbes, highlight the significance of being accurate in the foreign language to attain better life opportunities. The present research paper aims to determine the incidence of communicative grammar instruction and activities in the enhancement of the grammatical competence. This study involved the tenth grade students of Colegio Particular Eloy Velásquez Cevallos and was conducted throughout a period of four months. Initial data was gathered through a pre-oral and written test, interviews and a questionnaire. After the treatment phase, the results of implementing the proposal were collected through a post-oral and written test and a questionnaire. The results of the data analysis showed that the combination of grammar with CLT principles highly contributes to better learning outcomes and strongly suggest the application of the theoretical and practical tools presented in this research paper in Ecuadorian classrooms.