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I'm confused between these two sentences:

  1. Till what time of the day does the registration remain open?

  2. Till what time of the day does the registration remains open?

I understand that 'does' is always used with a singular noun. But my confusion is with the form of verb for 'remain'.

Please also explain your answer to prevent future conflict of the same sort.

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2 Answers 2

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Till what time of the day does the registration remain open?

The rule is very simple. With the auxiliary verb "do", the main verb always takes the bare infinitive.

There is never any exception to this rule.

Do you remain? Does he remain. We did remain.

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Here, the 's' is a conjugation of the verb as third person, present tense. The verb in the sentence is "does remain", a combination of an auxiliary verb and a main verb. You never duplicate the conjugation of a verb, so in your sentence, "remain" is the correct form.

If I may make a phrasing suggestion, "till what time of day" is not incorrect, but "how late" is more idiomatic.

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