This study compared the effects of two types of form-focused tasks on proceduralization and transfer of linguistics knowledge in case of English modals. All participants of the study attended pretests, posttests and delayed posttests. The procedural comprehension and production knowledge were measured through the groups’ performance on a timed dual task test that resembled the context of practice. The transfer of knowledge was measured by evaluating the performance of participants on a timed dual task test in a context dissimilar from or reverse to the practice context. Three intact classes of intermediate EFL learners were randomly assigned to experimental and control groups. The output group (n= 27) received explicit grammar instruction and a combination of three output practice, while the input group (n=25) received explicit instruction and a combination of three input practice. Identical texts were exposed to the control group (n=25) through listening and reading tasks. The texts were followed by some questions irrelevant to English modals. On the procedural knowledge posttests, the experimental groups outperformed the control group. The participants were able to transfer the knowledge to dissimilar contexts. The results may help language teachers design more effective activities for the learners considering the institutional constraints.