Which is the correct comparative or superlative adverb?

Of the two basketball teams, Kate's team played harder or hardest?

When comparing her with one other person (so that two people are being compared), use the -er word.

When comparing her with two or more other people (so that three or more people are being compared), use the -est word.

http://grammar.ccc.commnet.edu/grammar/adjectives.htm
Scroll down to Degrees of Adjectives.

http://www.lousywriter.com/adjectives_comparison.php

http://www.uottawa.ca/academic/arts/writcent/hypergrammar/compsupl.html

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The correct comparative adverb for the given sentence is "harder." The sentence compares Kate's team with one other team, so we use the -er form of the adverb. This form indicates a higher degree of the adverb compared to one other person or thing.

To review the general rules of forming comparative and superlative adverbs, you can refer to various grammar resources, such as:

- The Capital Community College Foundation website offers an explanation of degrees of adjectives: http://grammar.ccc.commnet.edu/grammar/adjectives.htm. Scroll down to the "Degrees of Adjectives" section for additional information.

- The Lousy Writer website provides a page specifically dedicated to comparative adjectives and adverbs: http://www.lousywriter.com/adjectives_comparison.php.

- The University of Ottawa's HyperGrammar website offers a section on comparative and superlative forms of adjectives and adverbs: http://www.uottawa.ca/academic/arts/writcent/hypergrammar/compsupl.html.

Feel free to explore these resources for more comprehensive explanations and examples.