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 interrogatives like your example the tense (here, present) is marked on auxiliary "do" and the lexical verb is the plain (infinitive) form.
    – BillJ
    Aug 16, 2022 at 11:42

1 Answer 1


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".

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