How to form the -er and the -est of Adjectives?
1. If the base form of an adjective ends in -e, simply add -r/st to the base form. Example: rare - rarer - rarest rare is the base form. 2. If the base form of an adjective ends in -y, change y to i and add -er/est. Example: heavy - heavier - heaviest 3. If the base form of a one-syllable adjective ends with a single vowel and consonant, double the final consonant and add -er/est. Example: thin - thinner - thinnest 4. Simply add -er/est to the base form of most other adjectives. Example: small - smaller - smallest
Base Form is also called Positive
-er Form or Comparative
-est Form or Superlative