adverb
modifies a verb, adjective, or other adverb, indicating the manner in which something is done
preposition
shows the relationship between a noun or pronoun and other words in a sentence
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The marathon runner completed the race without stopping once.
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I can drive for hours without stopping, I love road trips.
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I can binge watch a whole season of my favorite show without stopping.
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She worked tirelessly on her project, like a machine without stopping.