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Bad is always an adjective. The second sentence is correct because badly is an adverb that tells how the speaker did on the test.
Incorrect: I did bad on my accounting test because I didn’t study.
Correct: I did badly on my accounting test because I didn’t study.
Badly is always an adverb. The second sentence is correct because bad is an adjective that describes the noun thunderstorm.
Incorrect: The coming thunderstorm looked badly.
Correct: The coming thunderstorm looked bad.
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