This article explores strategies to enhance the grammatical understanding and communicative competence of intermediate-level adult second language learners by designing targeted pedagogical activities. It focuses on how pre-task, while-task, and post-task activities can effectively support learners in grasping complex grammatical concepts and applying them in real-world communicative scenarios. The study emphasizes that using grammar in authentic contexts significantly improves learners ability to communicate fluently in English, bridging the gap between theoretical knowledge and practical application.By integrating theory with practice, the article underlines the importance of designing teaching activities that are not only engaging but also aligned with the specific learning needs of adult students. The pre-task phase activates prior knowledge and introduces essential terms, while the while-task phase deepens understanding through critical discussion and note-taking. The post-task phase reinforces the application of learned grammar through role-plays and reflective writing, ensuring that learners can transfer their grammatical knowledge to everyday communication situations.Furthermore, the article provides practical insights into teaching strategies that foster active learning and critical thinking, encouraging learners to not only memorize grammar rules but also use them creatively in meaningful interactions. These strategies offer valuable guidance for educators in creating more effective grammar instruction plans tailored to adult learners' unique needs, ultimately enhancing both their linguistic proficiency and problem-solving skills.