A subordinating conjunction is a DMW. Subordinating conjunctions are conjunctions that subordinate one part to another part (as opposed to a coordinating conjunction). Usually, we see them subordinating a dependent clause to an independent clause.
The most common subordinating conjunctions in Greek are οτι, ει, καθως, ως, γαρ, and οτε.
In Hebrew, the conjunction כִּי is often used as a subordinating conjunction.