 Sentential adverbs were beginning to be developed and adverbs became used in more specific ways, and the vowel weakening -"e" in tandem with more easily expressed -"ly" forms caused -"ly" to become the dominant adverbial form.Although there were no categorical changes between flat adverbs and the new adverbs, their use was generally limited.More and more adverbs took on this form for greater homogeneity among the class.