چكيده لاتين :
This study draws on two different but commensurable research areas in
second language acquisition: First, the recent development accounting
for the optionality and variability of L2 learners in the use of inflectional
morphology of verbs (Surface Form deficit Hypothesis, Failed
Functional Feature hypothesis) and also another recent development
claiming that by focus on form instruction in context, the attention
resources of L2 learners can be directed to the problematic linguistic
elements and thus make these linguistic elements more likely to be
acquired. As indicated, in the first research area the attempt is to locate
the source of this variability while, in the second research area, the
attempt is to reduce the variable divergent forms. The findings showed
that positive evidence alone was not enough for the targeted linguistic
forms to be acquired. Neither were different types of FonF effective
enough to create significant and lasting changes in the performance of
the learners.
