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Is the know in the sentence "Do you know where the mall is?" classified as a (bare) infinitive?
Is seems to, because the construction seems to be auxiliary verb + infinitive, much like "can know" or "would know", but the auxiliary verb is not modal, so I'm not sure.
Yes. In clauses with a auxillary verb, you will get a verb in one of the unchanging forms, either a past participle "have known", a present participle "is knowing" or the base form of the verb, also called the bare infinitive "do know".
