condition on extraction domains (CED)

A proposed CONDITION in GOVERNMENT-BINDING THEORY restricting the class of DOMAINS from which CONSTITUENTS may be moved: no constituent may be extracted out of a domain which is not properly GOVERNED. Non-properly governed positions in English include ADJUNCTS and SUBJECT positions. An example is the ‘adjunct condition’, which prohibits movement out of adjuncts: from a sentence such as You made a high score during which match? the condition would forbid *Which match did you make a high score during?