" Yes. Only d o is inflected for tense. It is the verb of the main clause.
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AnonymousIs it because of the word "did?"Yes. Only do is inflected for tense. It is the verb of the main clause. Come to Jamestown is a non-finite complement.
AnonymousWhy is one of them "come" and the other "came?" Is it because of the word "did?"Right. 'Do/Does/Did' is used for questions and negative statements: