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Can I say, "He is the only person that I know."?

Are there rules about using that to describe people?

marked as duplicate by RegDwigнt May 12 '14 at 10:01

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  • 3
    Relative that can only be employed in restrictive clauses, but there is no constrain on its referent. – StoneyB May 12 '14 at 3:17
  • 2
    Which means that, yes, you can use relative clauses with that instead of who when referring to persons. As long as the relative clause is restrictive. – John Lawler May 12 '14 at 4:12

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