Subordinating conjunctions

Subordinating conjunctions join independent and dependent clauses. A subordinating conjunction can signal a cause-and-effect relationship, a contrast, or some other kind of relationship between the clauses. Common subordinating conjunctions are because, since, as, although, though, while, and whereas. Sometimes an adverb, such as until, after, or before can function as a conjunction.

I can stay out until the clock strikes twelve.

Here, the adverb until functions as a subordinating conjunction to connect two ideas: I can stay out (the independent clause) and the clock strikes twelve (the dependent clause). The independent clause could stand alone as a sentence; the dependent clause depends on the independent clause to make sense.

The subordinating conjunction doesn’t need to go in the middle of the sentence. It has to be part of the dependent clause, but the dependent clause can come before the independent clause.

Before he leaves, make sure his room is clean.

If the dependent clause comes first, use a comma before the independent clause.

I drank a glass of water because I was thirsty.

Because I was thirsty, I drank a glass of water.