Adverbial clause has a function to modify the verb.
Adverbial clause consist of :
- Cause or Reason,
As soon as he left, they cleaned the place.
We will stop where we can rest.
Because you have done your work, you can go home now.
Although it is sunny, she still brings umbrella.
I can do it better than you can.
If I were you, I would accept the job.
I wear my new shirt so that I would feel more comfortable.
My jeans are so tight that I feel uncomfortable.
He ran as if he had chased by a rabid dog.