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How does serverfault, stackoverflow and other stackExchange sites connect together?

Is that does or do?
Because I'm talking about multiple items, it would be do. What is more correct?

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@Ham and Bacon: um, that's infinitive, not plural. Which is exactly what one would expect to see in that place. – RegDwigнt Jun 20 '11 at 12:09
Ohhhh.... thanks! blushing slightly – Thursagen Jun 20 '11 at 12:14
up vote 8 down vote accepted

The correct way to ask that question would be with "do". Consider these two examples:

How does StackOverflow connect to ServerFault?

In that case one item is being considered. Now what if we change the way the verb connect is being used a little and add a second part to the subject so that it is effectively plural:

How do StackOverflow and ServerFault connect with each other?

Although in both cases the verb "connect" is being used, in the first case the subject being discussed is singular and in the second the two part subject is, considered as a whole, plural.

The giveaway would be if you dropped the specific names and just asked your question with the word "sites":

How do sites connect together?

When switching from a singular to a plural subject, the helping verb does need to change.

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I will accept your answer, because it's clear and formatted. Thanks a lot :) – genesis Jun 20 '11 at 12:35
I think the term you are after is Number agreement. – user1579 Jun 20 '11 at 12:55
@Rhodri and @Caleb I would refer to it as noun-verb agreement. Yes, that is sourced from the Wikipedia article for British English. Yet I was taught this in my grade school in Las Cruces, New Mexico, so I think it is widely accepted beyond the U.K. – Ellie Kesselman Jun 20 '11 at 17:22
+1: a very informative answer! – RiMMER Jun 24 '11 at 22:06

I have to disagree with Ham and Bacon's answer; the correct verb is "do". The reason I believe his answer is not applicable is, he's talking about a list of countable direct objects; your construction is talking about an uncounted collection of subjects. (I'm not sure which of those distinctions makes the difference at the moment. :-) ) Nobody, I hope, would think of saying "How is John, Jim and Joe doing?". Similarly, if you simplify your own sentence a bit, you get "How does Serverfault and StackOverflow connect?", which should sound wrong to any trained native ear. Serverfault and StackOverflow (and the others) are a group, and even though they are individually called out, they are still being treated as a collection grammatically, and therefore take the plural verb.

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"How is John, Jim and Joe doing?" - so what's correct for this sentence? – genesis Jun 20 '11 at 12:30
@genesis: That would be: "How are John, Jim and Joe doing?" – Caleb Jun 20 '11 at 12:32
Oh, missed that "is" :D Thanks – genesis Jun 20 '11 at 12:33
Thanks you a lot Hellion. You deserve voteUp – genesis Jun 20 '11 at 12:36

This should be

How do serverfault, stackoverflow and other stackExchange sites connect together?

because "sites" is plural so the verb should also be plural. The names of the sites shouldn't confuse things; you can treat them as adjectives. If you drop them out, you have

How do [these] sites connect together?

If you put does in this place, it is wrong because it does not match the subject.

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Nah, actually it's not because of the sites, it's much simpler. "A connects to B" ⇒ "How does A connect to B?"; "A, B and C connect" ⇒ "How do A, B and C connect?" That's all there is to it. (And note how it's completely irrelevant whether C is singular or plural.) – RegDwigнt Jun 20 '11 at 13:04
Well, OK, then. That's easy. – Kit Z. Fox Jun 20 '11 at 13:12

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