What is an adverb clause?
An adverb clause (also called adverbial clause) is a dependent clause (or subordinate clause) which functions as an adverb.
Types of adverb clauses
There are many types of adverb clauses:
He thinks he will be happy where he has recently moved.
He wrote the book when he was 25.
The kids cleaned the room as we wanted.
I forgave him because I liked him.
They bought a piece of land so that they can build a bigger house.
Although he is very old, he runs fast.
If I had a lot of money, I would travel around the world.
He can run as fast as a world champion.