Question

great! now try one more problem to show youve really got it.
is the highlighted portion of the sentence a complete or incomplete thought?
because supergirl is afraid of zebras, she had to skip our class trip to the zoo.

Explanation:

A complete thought (independent clause) can stand alone as a sentence, having a subject and a predicate that expresses a full idea. An incomplete thought (dependent clause) relies on another clause to make sense. The highlighted portion "Because Supergirl is afraid of zebras" is a dependent clause (starts with the subordinating conjunction "because") and does not express a full, independent idea on its own. So it's an incomplete thought.

Answer:

Incomplete thought