I didn’t revise enough so I didn’t pass the exam. Modifying adverbs, of course, are normally placed before the adjectives or adverbs that they modify, so if we want to use the less common ...

Adverbs are words that modify verbs, adjectives or other adverbs. ‘Farmer Frank drives carefully.’ ‘Carefully’ is an adverb describing ‘drives’. It tells us how Farmer Frank drives.