This research article examines the licensing of complementizer agreement with nominals (namely thematic subjects and objects) in the left periphery, focusing on data from Jordanian Arabic (JA). It demonstrates that obligatory complementizer agreement with A-bar elements is evident in JA grammar due to the effects of the Agree Identification Condition, which enforces an agreement inflection on the probe when the goal is not phonologically overt (e.g., a pro). This enforcement also applies when the probe agrees with a chain consisting of two silent links (e.g., when the complementizer agrees with a wh- or a focused element). This finding supports the proposal that the morphological realization of Agree dependencies is ruled by interface conditions, which are also proven to be responsible for the presence of an obligatorily overt complementizer when extraction of the embedded nominal takes place.
