The context is talking about the pros and cons of a certain city. I'm not sure if the verb 'to be' should agree with the subject here or with the predicate, although I would say 'is'.

  • 1
    Verbs always agree with their subjects, not their complements.
    – gotube
    Commented Oct 3, 2021 at 5:33
  • For pros and cons, you have to say here: I think one of the pros is the sights.
    – Lambie
    Commented Jul 19, 2022 at 14:56

1 Answer 1


"Is" The verb should agree with the subject when it has a clear number.

But the sentence is badly phrased. It can easily be improved by just swapping it around

I think the sights are a pro.

But I don't like the use of "pro" here, and "sights" is a weak and generic word.

The view from the top of the castle is one of the best things about the city.

There is a much better sentence. It doesn't have the weak sense of "the sights", it is much more specific to this city. It doesn't have "pro" and there is no problem choosing "is/are". I've removed the "I think"; it is not required and removing it makes the sentence stronger. You can swap it around

One of the best things about the city is the view from the top of the castle.

  • Thanks so much for the detailed answer. I agree with all the stylistic changes you have made. I'm grading an essay and I didn't want to completely change what the student had written. (they used 'are')
    – Moscovite
    Commented Oct 2, 2021 at 21:11

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