I remember that, way back in high school, one of my English teachers insisted that we use the word “that” when referring to anything non-human, and “who” when referring to a person.
Yet I hear educated people say, “the person that…” all the time. Did my English teacher make up this rule, or has anybody else been taught the same thing?
I’ve never heard that rule. I would think the “who” rule would work along the same lines as the “which” rule - if its clause can’t be set apart from the main clause by commas, use “that” instead.
I have tutored kids for the SAT II Writing test many times, and I state categorically that the official way is to use “that” for things, and “who” for people. Cross this up on that test, or put it in your essay, and you’ll be wrong.