 He also makes two specific assumptions about the derivation of passive clauses. First, Case assignment to the position immediately after the verb is “suppressed”, which entails that the NP there will not get Case unless it moves to some other position. (The subject position is the obvious one, because there it will receive Nominative Case.) Second, there is an unusual assignment of semantic role to NPs: instead of the subject NP being identified as the agent of the action the clause describes, that role is assigned to an adjunct at the end of the VP (the by-phrase in (A.ii); an adjunct is a constituent with an optional modifying role in its clause rather than a grammatically obligatory one like subject or object).