First, briefly explain the meaning of a subordinate clause. Then give the students a list of complex sentences. Ask them to identify the subordinate clauses and the subordinating conjunctions, as well as to explain the relationship expressed in each sentence. The next step is practice. Ask the students to combine two sentences or a set of isolated ideas into one sentence by using appropriate subordinating conjunctions.
Wind resistance is reduced.
It is used for electric wiring. It reaches a pre-set temperature. It is longer than a machine language version. It can run on many different computers. The cat jumped into the pool.