Subordinating conjunctions also join two clauses together, but in doing so, they make one clause dependent (or "subordinate") upon the other. A subordinating conjunction may appear at a sentence beginning or between two clauses in a sentence.

Where do subordinating conjunctions go in a sentence?

Subordinating conjunctions that fall in the middle of a sentence are generally not preceded by a comma. This is the opposite of what is done with coordinating conjunctions, or words that join two independent clauses (for, and, nor, but, or, yet, and sometimes so).

What is the rule for subordinating conjunctions?

There is only one rule to remember about using subordinate conjunctions: A subordinate conjunction performs two functions within a sentence. First, it illustrates the importance of the independent clause. Second, it provides a transition between two ideas in the same sentence.