Subordinate clauses, which we have already
talked briefly about, are clauses which are subordinated to the main clause of
the sentences, and which are introduced by subordinating conjunctions – words
like if, after, although, so that, when,
unless, and so on. (See page 145 in your text for a refresher.)
Like all dependent clauses, subordinated
clauses have both a subject and a finite verb, but their meaning is incomplete.