the adverb clause

An adverb clause functions as an adverb. This clause answers any of these
questions—How?When?Where?Why? Howmuch? Howoften? It has a subject
and a verb, but it cannot stand alone as a complete thought. It needs to be
joined with an independent or main clause to make sense. An adverb clause
starts with any of the following subordinating conjunctions:

after although as
as if as long as as soon as
as though because before
if in order that once
provided that since so that
than though unless
until when whenever
where wherever while

Each adverb clause is underlined in the following sentences:

After the captain docked the large ship, her crew members cheered.
(When?)
Because his arm was aching, Mr. Hopkins went to the doctor. (Why?)
You can go with us if you would like to do so. (How?)
Monica is more intelligent than she thinks she is. (How much?)