  In this paper, we set out to quantify the syntactic capacity of BERT in the
evaluation regime of non-context free patterns, as occurring in Dutch. We
devise a test suite based on a mildly context-sensitive formalism, from which
we derive grammars that capture the linguistic phenomena of control verb
nesting and verb raising. The grammars, paired with a small lexicon, provide us
with a large collection of naturalistic utterances, annotated with verb-subject
pairings, that serve as the evaluation test bed for an attention-based span
selection probe. Our results, backed by extensive analysis, suggest that the
models investigated fail in the implicit acquisition of the dependencies
examined.
