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I have this sentence: "Kaieteur Falls, which/that is 741 feet tall, is located in Guyana. My English teacher told me "that" would be correct. However, I strongly believe "which" would be correct. Could someone explain which one is correct?

Also, I am aware of threads such as that vs which vs what or others, and I have looked through those. I am fairly certain that "which" would be correct by reading these threads, but my English teacher thinks different.

marked as duplicate by Mari-Lou A, JJJ, JonMark Perry, jimm101, kiamlaluno Jun 22 '18 at 0:44

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    Your teacher is wrong. You can never use that after a comma like that. – tchrist Feb 6 '18 at 4:02
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    This question makes no sense at all. None. Can you please rollback the edit? – Mari-Lou A Jun 20 '18 at 18:49
  • @Mari-LouA I’ll leave that up to sumelic:) Anyways, I got in trouble at school for asking this on here, so I tried to delete it, but I couldn’t. Therefore, I tried to just edit away the question. – Jonathan Harbaugh Aug 5 '18 at 17:32

which is 741 feet tall is a nonessential relative clause, so it's correct to use which and a comma there. A nonessential clause (also known as a nonrestrictive clause) is one that just adds extra, nonessential information to the sentence and could be removed without changing the main meaning of the sentence: "Kaieteur Falls is located in Guyana." Your teacher is wrong.

  • Thank you for your answer dangph! I completely agree, and I'm glad you could provide a more technical explanation for why this is correct. – Jonathan Harbaugh Feb 6 '18 at 6:46

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