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Possible Duplicate:
Singular or plural following a list

    • Does your mother and father know about this?
    • Do your mother and father know about this?
    • What does "this" and "that" mean?
    • What do "this" and "that" mean?

Which option is correct? I thought the second one of each example is correct because we are talking about plural things.

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marked as duplicate by RegDwigнt Nov 8 '12 at 0:47

This question was marked as an exact duplicate of an existing question.

You are quite right. Only the fact that you are in doubt suggests that you may also wish to visit the stackexchange site for English language learners. This is still under development and not yet accepting questions, but it will do so when interest reaches a critical mass, and your participation would be welcome. – StoneyB Nov 8 '12 at 0:20
up vote 0 down vote accepted

In both cases, the plural form of the verb is correct.

Do your mother and father know about this?
What do this and that mean?

This is because as you stated, the sentence is speaking of two things, so the plural is appropriate. The second sentence sounds a bit awkward because "those" would be more natural, but it is still grammatically correct.

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