An independent clause expresses a complete thought and contains a subject and predicate, such as "The waves crashed onto the sandy shore." A dependent clause does not express a complete thought on its own as it is missing a subject or predicate, like "Even when I'm sick" or "When you have finished working." Dependent clauses often begin with words like "even," "when," "whenever," "wherever," "since," "as," "before," and "after."