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Bad versus Badly

20 一月, 2015 - 12:51

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.