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When I am talking about plural ("Sites"), should I use does or do? In case I'm talking in plural, I should use "do". But "like Facebook", is singular. So which one is correct?

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up vote 4 down vote accepted

In this case, you would use the plural "do." The prepositional phrase "like Facebook" modifies the plural noun "sites," and is not itself the subject of the sentence.

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Although really, you'd probably drop "do" altogether and say "Sites like Facebook use..." You'd still use the plural here, to agree with the plural subject. – Kit Z. Fox Jun 24 '11 at 23:17
Not always. If the main subject is say, a specific secure privacy technology, then sites like Facebook 'do' use this technology. Although realistically the Facebook site probably doesn't use it. – osknows Jun 24 '11 at 23:24
osknows, that still is a plural verb phrase. "many sites do use that technology". The singular would be "one site does use that technology" – teylyn Jun 24 '11 at 23:42
@teylyn I agree it's plural. I was indicating more about dropping the use of 'do' – osknows Jun 24 '11 at 23:50

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