Final answer:
To form the absolute superlative, drop the final '-o' from adjectives and adverbs in Spanish and add '-ísimo/a(s),' turning 'rico' into 'ricísimo' and 'grande' into 'grandísimo'.
Step-by-step explanation:
To form the absolute superlative of most adjectives and adverbs in Spanish, drop the final -o, if there is one, and then add -ísimo/a(s). This method of intensification is used to express the highest degree of a quality. For example, to transform the adjective 'rico' (rich/tasty) into its absolute superlative form, you would drop the final -o and add -ísimo to create 'ricísimo,' which means 'very rich' or 'delicious.' Similarly, 'grande' (big) becomes 'grandísimo,' meaning 'very big' or 'enormous.'
In some instances, adjectives that end in vowels other than -o may require different modifications before adding the -ísimo/a(s) suffix. For instance, the adjective 'feliz' (happy) becomes 'felícísimo' demonstrating an additional modification beyond simply adding the suffix. Therefore, while the rule primarily focuses on removing the final -o, one must be aware of the specific adjectives and their spelling changes when forming the absolute superlative.