0|Zero represents a zero complementizer (= subordinating conjunction); it may need to be deleted. The zero complementizer is generally the counterpart of the overt complementizer that. Example: Iâ ¹m sure 0 heâ ¹ll be here any minute. ... 0 stands in for overt subordinating conjunctions like that in tensed subordinate clauses, including relative clauses. So the relative clause the man I saw should be bracketed as follows: (NP (NP the man) (SBAR 0 (S (NP I) (VP saw) (NP T))))) (Santorini 1991)