1. Write más and then an adjective.
2. Use the adjective best or worst.
3. Construct a superlative adjective. Take the adjective: if it ends in a consonant, add an ísimo ending, and if it ends in a vowel, remove the vowel and then add an ísimo ending. The four possible ísimo endings are shown below:
If the chosen adjective has an accent, this accent mark is dropped in favor of putting the accent on the first i of ísimo.
Orthographic changes: