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I want to know how to differentiate between adverb and adjective like in this sentences:
1."He believes in working hard".
2."He is hard working man".
In both cases, "working" is a gerund, which is used like a noun, but I think in the first case, "hard" is an adverb and in the second case it's an adjective.
It's difficult to tell with hard, because adverb and adjective are the same. If you change it to quick, all becomes clear:
He believes in thinking quickly
He is a quick thinking man.
