modify - make less severe or harsh or extreme; "please modify this letter to make it more polite"; "he modified his views on same-gender marriage"

compare - to form the comparative or superlative form on an adjective or adverb

decline - inflect for number, gender, case, etc., "in many languages, speakers decline nouns, pronouns, and adjectives"

conjugate - add inflections showing person, number, gender, tense, aspect, etc.; "conjugate the verb"

mouth, speak, talk, verbalise, verbalize, utter - express in speech; "She talks a lot of nonsense"; "This depressed patient does not verbalize"