|Definition - A clause that functions as an adverb, i.e. it modifies a verb or an adverb.|
In the examples below, the adverbial clause is bolded.
(1) Wherever he goes, he leaves a mess behind.
(The adverbial clause modifies the verb leaves.)
(2) Mike enjoyed the fiasco more than I did.
(The adverbial clause modifies the adverb more.)