The present study aims to probe into learners' perceptions of blended learning in relation to the respective roles of face-to-face learning (f2f learning) and online learning as well as their interaction in the blended EFL contexts. Questionnaires were used in the study to examine the attitudes of 296 university students towards a blended English course learned at the university. The results showed that students were generally positive about blended learning and they also acknowledged the interdependencies between f2f learning and online learning in the blended English course. The two learning modes were also considered to play different roles in English learning. Participants thought that online learning was more advantageous to listening and f2f learning promoted the learning of world knowledge and helped to improve learners' interests in learning English. The findings of the research shed light on how f2f and online learning interplay with each other in the blended learning context so that the learning environment can be better integrated for English learning.