In instructed second
language (L2) settings, instructor-provided input
is essential for learners’ interlanguage
development. While some input is consciously
modified by instructors to assist learners, much
of instructors’ speech contains inherent
linguistic variability mediated by linguistic,
social, and situational factors. Variable,
learner-directed input may also be influenced by
instructors’ individual characteristics (e.g.,
Gurzynski-Weiss, Geeslin, Long, & Daidone,
2017; Gurzynski-Weiss et al., 2018). The present
study extends this work by examining instructor
first language (L1) in relation to patterns of
variable subject expression in Spanish in
learner-directed classroom speech. Twelve
instructors of second year, university-level L2
Spanish – half with L1 Spanish and half with L1
English – were recorded teaching one
vocabulary-focused lesson. Analyses of subject
forms produced in finite clauses in relation to
independent variables known to constrain subject
expression in Spanish revealed that some constraints on
subject form use in instructor speech were
influenced by the instructors’ L1.