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Possible Duplicate:
[Singular] Is/Are [Plural]?
Singular or plural following a list
Verb agreement in “Where is the Messiah and his Kingdom?”

I am having trouble with the following sentence:

"The complexity and diversity of the new platforms is worrying us."

If "complexity" and "diversity" constitute two subjects, then the verb should presumably be "are"; however, the sentence feels more natural with "is". Is this correct? Is there a linguistic term for this occurrence?

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marked as duplicate by Robusto, MετάEd, cornbread ninja 麵包忍者, StoneyB, simchona Jan 11 '13 at 2:45

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

From the "possible duplicates", the first two are (rather obviously) different from my question, and the answers to the third are somewhat inconclusive. It would be a good thing if questions are judged as being duplicates based on their content, rather than merely their title. – Douglas Jan 11 '13 at 12:33
up vote 4 down vote accepted

Yes, it is just fine. Compare:

  • “My lord and husband is come home.”
  • “Peanut butter and jelly is the best sandwich of all.”
  • “Simon and Garfunkel sounds really mellow right now.”
  • “Tide and time waits for no man.”
  • “Our President and CEO is Joe Schmoe.”
  • “Running and jumping is all I want to do today.”
  • “The master and commander has not yet returned.”
  • “Yesterday is gone; today is fleeting as we speak; tomorrow and tomorrow and tomorrow is all that remains to us.”

It happens when the subject is thought of as one thing. Sometimes it is two things that are so fused as to be thought of together. Sometimes it is two names for the same thing.

Do not let that little and make you think that a plural verb must necessarily follow. It does not have to, and sometimes should not.

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Thanks, that is a convincing explanation! I had already thought of another example similar to "running and jumping", although I am quite surprised at the "tide and time" case. – Douglas Jan 10 '13 at 22:09
@Douglas Tide and time are the same thing, not two things. This is the eventful tide, not the soggy one. – tchrist Jan 10 '13 at 22:10
Yes, I was curious and found your discussion on the matter: english.stackexchange.com/questions/95513/…. – Douglas Jan 10 '13 at 22:11
Superb examples, and 'It happens when the subject is thought of as one thing. Sometimes it is two things that are so fused as to be thought of together. Sometimes it is two names for the same thing.' is categorical. – Edwin Ashworth Sep 7 '14 at 11:13
@tchrist interesting that you instinctively revert to "tide and time are" in your comment... – Ant P Dec 19 '14 at 0:16

The number of the verb depends upon whether the worry is caused by the diversity, the complexity, or their combination.

If you could cope with either the complexity of the situation or the diversity alone but in combination they cause worry, then the singular subject requires the verb "is".

On the hand if the complexity alone would cause worry, then there are (at least) two causes that demand a plural verb "are".

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Thanks for the answer! – Douglas Jan 11 '13 at 12:29

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