This study investigated the effectiveness of different types of Form-Focused Instruction (FFI)—isolated, integrated, and the combination of both—on learning various forms of past tense: simple, continuous, and perfect among intermediate English as a Foreign Language (EFL) learners. 60 female students were chosen and randomly assigned to three different groups. After six hours of instruction per week for four weeks (24 hours in total), the results of the study showed that the combined group outperformed the other two groups. The group with the integrated strategy ranked second while the isolated group placed third. Implications of the study as well as the suggestions for future research are discussed in detail.