Key points are not available for this paper at this time.
The Zone of Proximal Development (ZPD) first articulated by the Soviet psychologist Lev Vygotsky. It is the difference between what a learner can do without receiving any help and what he can do after receiving help. Not much research has been conducted in the role of ZPD and the students' learning of learning English grammar. This study attempts to investigate ZPD in the realm of teaching English adverbs.
Rezaee et al. (Sun,) studied this question.