A subordinate clause (or dependent
clause) is one that cannot
stand alone as a complete sentence, because it does not express a complete
thought.
Examples:
The
crew could see the whale, which had surfaced only 50m behind them.
independent clause
subordinate clause
(i.e., could stand alone)
(i.e., could not stand alone)
Which had surfaced only 50m behind them.
(This is wrong. It is not a complete thought
or a sentence.)
Interactive example:
The
mechanic replaced it with the one that was in the Ford.
[show me the subordinate clause]