A CLAUSE is group of words that contains a subject and predicate (subject/verb combination).
EXAMPLES: the cat climbed the tree
although the tree's bark was slippery
There are two types of clauses: DEPENDENT clauses (also known as subordinate) and INDEPENDENT clauses.
A DEPENDENT clause is a clause that cannot stand by itself. Dependent clauses begin with subordinating conjunctions.
Example: although the rain fell heavily
if we can't get to the station on time
when we arrive home