Rule reminder
'Chi' as a relative pronoun means 'whoever', 'the one who', or 'those who'. It always takes a singular verb (like 'colui che'). It is used when the antecedent is unspecified: 'Chi studia riesce' = Those who study succeed. Do not confuse with 'chi' as an interrogative pronoun.
___ arriva tardi non potrà partecipare alla riunione.