I would say that higher learning (or higher education) is a noun phrase. " However, both "high" and "highly" are used, in different contexts, as adverbs. I thought highly of him.
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park sang joonAnd I couldn't find 'higher' as the adverb.Dr D gave you an example.
park sang joonI'm curious of what remark you would made if you hadn't used the 'when clause'.But I did use the 'when' clause. That was essential to the sentence.
Dr D gave you an example.
But I did use the 'when