What are subordinating conjunctions?

Subordinating conjunctions are used to connect two simple sentences: a main clause and a subordinate clause. 

Subordinate clauses do not make sense on their own, they are dependent on the main clause.


They are not allowed to go out and play until they finish tidying the house.

Below is a list of common subordinating conjunctions:

after, before, though, because, so that, until, while, provided, if, since, once, even though, whether, unless, although, when, as.


In this level, you will be asked to choose between subordinating conjunctions.

Here is an example of the type of question you will be asked:

Choose the best subordinating conjunction to complete the sentence.

Andrea is tired ______ she stayed up all night watching television.

(because / since)

The correct answer is because.