1. Adverb Clause
A group of words that begins with an adverb clause signal word, has a subject and a verb, and all of these words collectively describe a verb , an adjective or another adverb.

2. Adverb Clause Signal Words
After If
until
Although
in order that
when As
whenever
since
As if
where
so that
As long as
wherever
than
As soon as
while
though
Because
unless
Before

3. Adverb Clause modifying a Verb: signal words / verb in clause
After I had proofread my paper, I typed it.
Because manicotti takes so long to prepare, Joy makes it only on special occasions.
You may come with us if you want to.

4. Adverb Clause modifying an adjective: signal words / verb in clause
His pitching arm is stronger today than it ever was.

5. Adverb Clause modifying an adverb: signal words / verb in clause
My cousin Adele reads faster than I do.