Interlingue grammar
Derived adverbs are adverbs made by putting -men at the end of an adjective (rapid = quick, rapidmen = quickly). This is similar to -ment in French, -mente in Italian, and other Romance languages. The ending -men was inspired by Provençal and spoken French (which does not pronounce the t in -ment) and chosen over -mente to avoid clashing with the noun ending -ment and other nouns in the language derived from the past tense in -t. The ending may be omitted when the meaning is clear: tu deve far it rapid(men) = you must do it quick(ly).