Adverbial clause - Wikipedia
https://en.wikipedia.org/wiki/Adverbial_clauseAn adverbial clause is a dependent clause that functions as an adverb. That is, the entire clause modifies a verb, an adjective, or another adverb . As with all clauses, it contains a subject and predicate, though the subject as well as the (predicate) verb may sometimes be omitted and implied (see below). An adverbial clause begins with a subordinating conjunction—sometimes called a trigger word. (I…