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Is it correct in terms of English grammar to say “ones” in this sentence:

“Traffic problems and pollution are ones of the main threats to the 21st century.”?

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  • ...are among the main threats of the 21st century.
    – user 66974
    Aug 22 '18 at 18:36
  • ...English grammar Aug 22 '18 at 18:38
  • No, it's not. If you're grouping traffic problems and pollution into a singular item, which I don't see how, but if you are, then you would say "one of the main threats." If you are not grouping them together, since they are two things, you would say "two of the main threats."
    – Billy
    Aug 22 '18 at 18:58
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One for a single item (singular verb) and some (plural verb) for multiple items.

Pollution is one of the main threats of the 21st century.

Traffic problems and pollution are some of the main threats of the 21st century.

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