Some adverbs, including those that can also be adjectives, use er and estto form comparisons.
Example: soon, sooner, soonest
Instructions: Form the comparative and superlative of these words.
1. early
2. high
3. fast
4. hard
5. often
–For answers scroll down.

1. early, earlier, earliest
2. high, higher, highest
3. fast, faster, fastest
4. hard, harder, hardest
5. often, oftener or more often, oftenest or most often

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from Daily Grammar Lessons Blog