The moon itself rotates, but it does so very slowly.
1. does so = rotates?
2. does = rotates, and so = intensifier?
desk red 604 1. does so = rotates? "So" is an adverb, a kind of placeholder used to avoid repetition of a previous phrase.
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desk red 6041. does so = rotates?
"So" is an adverb, a kind of placeholder used to avoid repetition of a previous phrase.
See the definition and examples under "mentioned earlier."
https://dictionary.cambridge.org/dictionary/english/so?a=bri