TO MAKE AN ADVERB, YOU TAKE THE FEMININE FORM OF THE ADJECTIVE, AND ADD -MENT. Match the adjective with the adverb. Be aware that there are some irregulars in the mix. EXCEPTIONS: 1. Adjectives that end in -ent or -ant; drop -ant or -ent and add -amment or -emment, respectively. 2. Adjectives that end in a vowel do not change to the feminine. Simply add the -ment.