Question

is the highlighted portion of the sentence a complete or incomplete thought?
mr. smithers laughed at my joke, spitting out his
water.
complete thought incomplete thought

Explanation:

A complete thought requires a subject and a predicate that expresses a full idea. The highlighted portions ("spitting out his" and "water") lack a clear independent subject-predicate structure that can stand alone as a full, coherent idea; they are dependent descriptive fragments tied to the main clause.

Answer:

Incomplete Thought