Optional Infinitive (OI) stage introduces a period in early language acquisition process through which finite and non-finite forms co-occur in similar contexts. With this regard, this book highlights the comprehension and production of OI features including application of infinitive markers, subject-verb agreement, and tense markers by Persian lower and upper intermediate EFL learners. The work aimed at exploring the effect of learners' proficiency level and L1 transfer on the acquisition of these features. Moreover, it attempted to apply its results to Truncation and Unique Checking Constraint as two major models proposed to explain OI features through a critical view. The results can provide second language teachers and syllabus designers with pedagogical feedback and helpful information on the related features attributed to each proficiency level.

Auteur

Hamide Behroueian is a University lecturer in Teaching English as a Foreign Language (TEFL). She got her Bachelor of Arts in English Literature in 2009. She also received her Master of Arts degree in 2013 in the field of TEFL at Yazd University. Currently she has been teaching as a University lecturer in Yazd, Iran.