Final answer:
The sentence is about Stanley's vigorous action of shaking his head. It is a potential component of a narrative, perhaps suggesting an intense or emotional reaction.
Step-by-step explanation:
The sentence 'Stanley vigorously shakes his head from left to right?' involves action by a character named Stanley. The word 'vigorously' is an adverb describing the manner in which Stanley performs the action of shaking his head. This sentence could be a part of a story, or it might occur in a play or other narrative form. It doesn’t contain a lot of context, but we understand that Stanley is engaged in some kind of emotional or intense reaction, as indicated by the adverb 'vigorously'.
Learn more about Narrative verbs & adverbs