Really Learn English gave the following rules that will help us learn how to use ‘bad’ and ‘badly’
(a) ‘Bad’ is an adjective. An adjective is a word that describes a person, place, or thing. ‘Bad’ is often used after linking verbs such as:
- the verb “to be” (am, is, was, were, are)
- The house is in bad condition after the fire.
- This seems like a bad book.
(b) ‘Badly’ is an adverb. Adverbs describe actions. ‘Badly’ is often used after action verbs.
- We played badly and lost the game.
- She sang badly.
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