Adverbs are formed from adjectives of one termination by adding to them mente; as, dulce, dulcemente: and from those of two terminations by adding mente to the feminine; as, gracioso, graciosamente. They admit the superlative; as, graciosísimamente.

When two or more adverbs ending in ly occur in the same sentence, the termination mente is added to the last only; as,

He speaks elegantly and correctly.
El habla correcta y elegantemente.