Compare the adverbs in the following sentences: They work hard. We work harder.
A. harder is the superlative form of hard.
B. harder is the comparative form of hardest.
C. ‘harder’ is the comparative form of ‘hard’.
D. harder is an adjective, not an adverb.

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Have to/Has toSubjunctivesTenses and ArticlesSynonymTenses - Present and PastConnectorsGrammar - Present Perfect with already, just, yetConjunctions in Complex SentencesWish SentencePersuasive TextOther quiz:
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