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case filter

SYNTAX: filter which requires an (overtly realized) NP argument to be case marked, or be associated with a case position. EXAMPLE: this filter rules out (i). No case is assigned to the subject position of the complement of seems; only by moving to the subject position of the matrix clause can John satisfy the case filter: it is assigned case there.

(i) a * it seems [ John to be angry ]
    b   John seems [ ti to be angry ]
More recently, the case filter has been reduced to the visibility condition. See also chain condition.
LIT. Chomsky, N. (1986a)
Chomsky, N. (1981)