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Consider we have a sentence:

I have a box named "A".

rewritten as such:

I have a box, the name of which is "A".

How should we rewrite the sentence if now there is more than one "item"?

I have three boxes, named "A", "B", and "C".

Is the sentence below grammatical? :

I have three boxes, the names of them are "A", "B", and "C".

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Technically, in your last example "I have ..." and "the names of them are ..." are independent clauses, and so should be separated with a period, colon or semi-colon. "I have three boxes; the names of them are 'A', 'B', and 'C'." – Jay Jun 8 '12 at 16:00
@Jay Do you mean to say that "The names of them are.." is grammatically valid? – Pacerier Jun 8 '12 at 17:12
Yes, "the names ..." is valid. PopMachine and Rudra give other gramatically-correct options. – Jay Jun 8 '12 at 20:09
up vote 11 down vote accepted

It is still "which" in the plural.

The following sentence is grammatical:

I have three boxes, the names of which are "A", "B", and "C".

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In your last sentence, you should replace "them" with "which"; so it becomes,

I have three boxes, the names of which are A, B and C.

Or, you could simply say,

  • I have three boxes, namely A, B and C.

  • I have three boxes, named A, B and C.

  • I have three boxes, A, B and C.

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A colon in the last bullet would be ultimately clear. – ThePopMachine Mar 4 at 17:29

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