Context: The process of morphological derivation in Catalan follows the same principles as the other Romance languages, where agglutination is common. Many times, several affixes are appended to a preexisting lexeme, and some sound alternations can occur, for example elèctric [əˈlɛktrik] ("electrical") vs. electricitat [ələktrisiˈtat]. Prefixes are usually appended to verbs, for as in preveure ("foresee").

Question: What is common in Romance languages?
Answer: agglutination

Question: What kind of derivation in Catalan is similar to other languages?
Answer: morphological

Question: What word additive is usually added to verbs?
Answer: Prefixes

Question: What other word changes can occur in derivations?
Answer: sound alternations

Question: What word supplement  can be put on an already existing word base?
Answer: affixes