It's usually an adverb. Ex. quickly, slowly, joyously..
Formal language I believe that is the right language
Thunder and lightning crash above a Scottish moor. Three haggard old women, the witches, appear out of the storm. In eerie, chanting tones, they make plans to meet again upon the heath, after the battle, to confront Macbeth. As quickly as they arrive, they disappear.
hope this helps :)
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