Hi.
All contestants should have to follow the same rules.
What's the form and function of the underlined part?
Where is CJ?
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All contestants should [have [to follow the same rules]].
"Have" is an infinitive verb functioning as 'head' of the subordinate infinitival clause "have to follow the same rules (in outer brackets), functioning as complement of "should". Within that clause is the infinitival clause to follow the same rules (in inner brackets) which is functioning as complement