Theory:
Adverbial Clauses
An adverbial clause is a group of words which contain a subject and a verb. It is always a dependent clause which means it cannot stand alone as meaningful sentence, and they usually start with although, because, if, until, when.
An adverbial clause acts like an adverb, and so there are several types:
Adverbial clause of Time
An adverbial clause of time states when something happens or how often, and it can be identified by the subordinating conjunction it begins with: after, as, as long as, as soon as, before, no sooner than, since, until, when, or while.
I stopped studying when the phone rang. (adverbial clause of time)
Adverbial clause of Place
An adverbial clause of place states where something happens, and it can be identified by the subordinating conjunction it begins with: anywhere, everywhere, where, or wherever.
I usually have a meal wherever I can find a good restaurant. (adverbial clause of place)
Adverbial clause of Manner
An adverbial clause of manner states how something is done, and they often start with one of the following subordinating conjunctions: as, like, or the way.
He played as if he was hurt.(adverbial clause of manner)
Adverbial clause of Degree or Comparison
An adverbial clause of degree or comparison
states to what degree something is done or offers a comparison. An adverb of degree often starts with one of the following subordinating conjunctions: than, as - as, so - as, or the - the.
He is as happy as he has ever been.(adverbial clause of degree or comparison)
Adverbial clause of Condition
An adverbial clause of condition states the condition for the main idea to come into effect. An adverb of condition often starts with if or unless. Such clauses are used to create conditional sentences.
If you study, you will pass the exam.(adverbial clause of condition)
Adverbial clause of Concession
An adverbial clause of concession offers a statement which contrasts with the main idea, and often starts with one of the following subordinating conjunctions: though, although, even though, while, whereas, or even if.
Even though I don't agree with you, I think your ideas are very good.(adverbial clause of concession)
Adverbial clause of Reason
An adverbial clause of reason offers a reason for the main idea, and often often starts with one of the following subordinating conjunctions: as, because, given, or since.
I ate the sandwich because I was hungry.(adverbial clause of reason)
Adverbial clause of Result and Consequence
An adverbial clause of Result and Consequence explain the consequence of the main idea, and often often starts with one of the following subordinating conjunctions: that, so&that, so that and such&that.
I was hungry so I ate the sandwich.(adverbial clause of Result and Consequence)