An adverb may be a single word such as quickly, here or yesterday (see the page
Adverbs), or a phrase such as the day before yesterday or to see my mother (see the page
Adverb Phrases). However, adverbs can also be clauses, containing a subject and a full verb. This page will explain the basic types of adverb clauses (sometimes called "adverbial clauses") and how to recognize them.
Adverbs, adverb phrases, and adverb clausesLook at these sentences:
In the first sentence, "yesterday" is a one-word adverb, "on Friday" is an adverb phrase, and "before I left for Calgary" is a adverb clause. All of them answer the question "When?", but the adverb clause has a subject ("I") and a full verb ("left"). It is introduced by "before", so it is a dependent clause. This means that it cannot stand alone: "Before I left for Calgary" would not be a full sentence. It needs a main clause ("I saw the movie"). An adverb clause, then, is a dependent clause that does the same job as an adverb or an adverb phrase.
Types of adverb clauseThere are many types of adverb clauses. Here are some examples of the most common types:
As you can see from the examples above, most adverb clauses can be recognized because they are introduced by a particular word or phrase (such as "when", "so that", etc.). These words and phrases are called subordinating conjunctions, and there are many of them, including the2e: