Syntactic Development

Pienemann (1998, 2015) put forward Processability Theory to enlighten why language learners follow definite developmental paths. The aim of the present study was to run a comparative investigation into the difficulty order of different grammatical structures for male and female Iranian EFL learners predicted by Processability Theory. 185 Iranian university students took part in this study. They received a Demographic Questionnaire and a Validated Researcher-Made Grammar Test designed based on the stages of Processability Theory. Item Response Theory (IRT) Rasch Modeling was used to analyze the collected data. Results pertained to the research questions revealed that the stages predicted by Processability Theory do not account for the Iranian male/female EFL learners. Another major finding emerged from the data was that the difficulty level of different grammatical structures presented by Pienneman in PT doesn’t match the difficulty order obtained in this study by male/female EFL respondents. All things considered, results of the study provided a reliable counterevidence for the assumptions of the theory.

This study explored the syntactic acquisition by Persian monolingual and Kurdish-Persian bilingual learners of English as a second and third language and the effect of instruction on beginner learners' syntactic acquisition with reference to UG-based non-primary language learning theories. A group of EFL learners (23 Persian monolingual and 73 Kurdish-Persian bilingual learners) were selected. They were divided into beginner, intermediate and advanced levels based on their performance on the Oxford Placement Test. A grammaticality judgment test, a translation test and a functional test were used to collect data. ANOVA analyses indicated that Kurdish- Persian bilingual learners of L3 English and Persian monolingual learners of L2 English were able to reset the parametric variations related to the intended features at intermediate and advanced stages of L3 acquisition, but they failed to do so at the initial stage. The Direct Access (DA) hypothesis, the Full Transfer/Full Access (FTFA) hypothesis and the Modulated Structure Building Hypothesis (MSBH) were found to best explain the findings. Paired-samples t -test showed that instruction positively influenced the acquisition of the syntactic features by beginner-level learners after the treatment.