That vs. which vs. who
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We’ll leave you with one of the more clear-cut distinctions: the difference between the relative pronouns that, which, and who. In the simplest terms, “who” is used when describing people, “that” is used for objects or groups, and “which” is used for…objects also? Damn it, we thought this was going to be easy.
Let’s start with who—use it to describe people. This is my friend Gabe, who is one of the funniest people I know.
“That” describes objects. She wants the tent that can fit six people. (Note: The information after “that” is integral to the sentence’s meaning.)
“Which” also identifies objects, but can be used in non-restrictive clauses—those that add information, but aren’t necessary. This red sweater, which I just got, is the wrong size. (According to YourDictionary.com, you should, “Look at the commas. If you use a comma to describe an object, use which. If you don’t use a comma, use that.”)
Now go forth and nail these distinctions forevermore. And one more thing to always keep in mind: They’re having their picnic over there.