Integrating form-focused instruction (FFI) in the communicative language class is the most recently used language teaching and learning approach today. To draw learners’ attention to grammatical form, FFI implements different types of corrective feedback and implicit and explicit grammar teaching techniques. This study investigated the effects of FFI combined to communicative grammar instruction on students’ pronunciation and grammar in speaking. The main objective of this study was to probe whether the form-focused instruction integrated with communicative grammar activities was effective in terms of students’ performance of pronunciation and grammar in speaking. The study employed a quasi-experimental study design with a mixed method approach. It also employed pre and post-tests, questionnaire, and interview in order to gather data. The data collected by the tests and questionnaire were analyzed quantitatively using independent and paired sample t-test where as the interview data was analyzed thematically. The results of the study revealed that the experimental group of students who had been taught spoken English having form-focused communicative grammar instruction showed the enhancement on pronunciation and grammar in speaking in their post-test scores. This directed to the conclusion that the form-focused communicative grammar instruction assisted the students advance their pronunciation and grammar in speaking. Thus, it is recommended that high school EFL teachers should implement communicative grammar activities integrated to form-focused instruction while teaching speaking skills.