Is there anybody can help me to figure out the clause highlighting with red is a relative clauses or appositive clause.
The reason why he is late is that he missed the early bus.
"Why he is late" is a relative clause modifying "reason." Within the relative clause, "why" is a relative adverb that functions as an adverbial adjunct with respect to "is late," analogous to a "because"-clause: "He is late because . . . ."
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