It was the first opportunity (that) people have had to vote . Yes: it's an NP with "opportunity" as head. Within the NP is the relative clause "(that) people have had to vote".
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It was the first opportunity (that) people have had to vote.
Yes: it's an NP with "opportunity" as head.
Within the NP is the relative clause "(that) people have had to vote".
"Have" (the marker of the perfect tense) is a catenative verb with the past-participial clause "had to vote" as its catenative complement.
The infinitival "to vote" is complement of