A dependent clause is a group of words that contains a subject and a verb but does not express a complete thought. An example of a sentence that includes a dependent clause is:
"Although it was raining, we decided to go for a walk."
In this sentence, "Although it was raining" is the dependent clause because it cannot stand alone as a complete sentence.
If you have specific sentences from your Quick Check that you'd like me to analyze, feel free to share them!