Which one is correct? In case both of them are correct, which one is more common?

  • How long have you and John known each other?
  • How long have you and John known one another?
  • 2
    It's a free choice in your example. As compound reciprocal pronouns, "each other" and "one another" are semantically equivalent, the former being more common – BillJ Feb 12 '17 at 17:42

Traditionally, each other refers to two people and one another refers to more than two people, but this distinction is disappearing in modern English.

So, to do things the proper way, you might want to use 'each other'.

You should check out this source.

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