Subordinate conjunctions are used to connect subordinate clauses to main clauses. A subordinate clause is a clause which contains a subject and a verb but cannot stand as a sentence on its own. A subordinate clause feels incomplete without a main clause.
For example, in the sentence "Since she was tired, she couldn't do her homework well," the subordinate clause is "since she was tired," and "since" is the conjunction which links the subordinate and main clause together.
In German, während, nachdem, bis, als, wie, weil, wenn, obwohl, dass, ob, bevor, anstatt, seitdem, and sobald are some common subordinating conjunctions. In these exercises, you will connect two clauses by choosing one subordinating conjunction from four options.