A subordinate clause is also known as a dependent clause because it cannot stand by itself. A subordinate clause begins with a subordinating conjunction like wenn, weil, als. A relative clause is also a type of subordinate clause. A subordinate clause can come before or after the main clause. The conjugated verb always goes at the end of the subordinate clause.
In this multiple-choice exercise, each sentence is missing the subordinate conjunction. Choose the correct subordinate conjunction from the four options provided.