Answer:
Asubordinate(or dependent) clause dose not express a complete thought and cannot stand by itself as a complete sentence.
Example: If wishes were horses
The meaning of a subordinate clause is complete only when the clause is attached to an independent clause.
Example: If wishes were horses, then beggars would ride.
Sometimes the word that begins the subordinate clause is the subject of the clause.
Example: This is a line that comes from a mother goose rhyme.
Example: When my grandmother was young, many children were learning mother goose rhymes.
Example: This is the trophy that out soccer team won.