"I like to run fast."
Translation:Mi ŝatas kuri rapide.
What's the difference between adjectives ending in -e and adjectives ending in -a
The words that end in -a are used to describe nouns.
The words that end in -e are used to describe verbs, dependent clauses, and other words that end in -e.
Generally, if it ends in -a we call it an adjective, and if it ends in -e we call it an adverb.