<span>An author’s style is </span>the ways in which he or she writes.
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This includes word choice, use of figurative language, etc.
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Most of the time, you'll want affect as a verb meaning to influence something and effect for the something that was influenced. The difference between affect and effect is so slippery that people have started using "impact" as a verb instead. Don't be one of them!
One qustion an adverb ansers is: How Often
Hope I helped