≡ Menu

Writers – That or Which? (Now With Bonus Who!) With Handy Chart

grammar this that or whoBy Allison VanNest of Grammarly.com

If you’re unsure about whether to use that or which in a sentence, you’re not alone in your confusion. According to Grammar Girl (AKA Mignon Fogarty), it’s one of the questions she gets asked most frequently.

This simple question has a surprisingly technical answer, so grab a caffeinated beverage and get comfortable.

Let’s start with some definitions. That, which, and who are all relative pronouns that can be used to introduce adjective clauses. Remember, a clause is a group of words that work together to perform a specific function in a sentence. In the case of adjective clauses, the group of words describes a noun.


  1. A painting that depicts a grouping of everyday objects is called a still life.
  2. The awards show, which was held at a new venue this year, was a huge disaster.

Notice that some of the bolded clauses are set off by commas while others aren’t. That’s because an adjective clause can be either restrictive or non-restrictive. A restrictive clause is essential to a sentence; without the clause, the sentence wouldn’t make sense anymore. Example #1 contains a restrictive clause. If we take away the clause, all we’re left with “A painting is called a still life.” Since not all paintings are still life, we know that we’ve lost an essential piece of the puzzle.

A non-restrictive clause, on the other hand, contains information that isn’t necessary to understanding the meaning of a sentence. It may add value or nuance, but the facts remain the same even if we remove it. Example #2 contains a non-restrictive clause; without it, the reader still knows that the awards show was a disaster. 

Restrictive clauses begin with that, while non-restrictive clauses begin with which. Furthermore, non-restrictive clauses need to be set off with commas. If you’re not sure whether a clause is restrictive, try taking it out and reading the sentence aloud. If it still makes sense and means what you intend to say, the clause is non-restrictive. If not, it’s a restrictive clause.

To add another wrinkle to the issue, adjective clauses that refer to people can begin with either who or that depending on the circumstances. Usually, you’ll use who, but if you have a nonrestrictive clause referring to a generic person or group of people (e.g. “girls that wear glasses” or “doctors that specialize in pediatric medicine”) that is also acceptable. If you’re unsure, however, just stick with who when referring to people.


Specific person, nonrestrictive clause: Mary, who enjoys opera and ballet, bought season tickets to the performing arts center.

Specific person, restrictive clause: The old man who lives down the street has a beautiful garden.

Generic person, nonrestrictive clause: Comedians, who are larger than life onstage, are often quiet and reserved off the stage.

Generic person, nonrestrictive clause: Students who/that eat breakfast before studying retain more information.

Still scratching your head? Here’s a handy chart:

Restrictive Non-Restrictive
Things and Places That Which
Specific Person or People Who Who
Generic Person or People Who, That Who

These rules may seem overwhelmingly complicated at first, but with practice it will become second-nature. Until then, an
automated grammar checker is your best friend. While using the wrong relative pronoun isn’t the end of the world, there will always be sticklers out there who are more than happy to point out even minor mistakes. Mastering these commonly confused words—and being able to explain why you used one instead of the other, if asked by a reader, editor, or client—will only contribute to the overall professionalism of your writing. 

What questions do you have? Ask them in comments.

About the Author: A self-proclaimed word nerd, Allison VanNest works with Grammarly to help perfect written English. Connect with Allie, the Grammarly team, and more than ONE MILLION Grammarly Facebook fans at www.facebook.com/grammarly.

Image: Attribution Some rights reserved by g_kovacs

Two newsletters:
About Freelance Writing
Writing With Vision

Go ahead and tweet this to your network – thanks!

{ 6 comments… add one }
  • Thanks, Ron… so are you.

  • Had to say this had me confused for a long time. Many thanks to Allison! And Anne, you are doing a good job.
    Ron C | Copy-e-Writing Blog recently posted..Top 5 Unmistakable Tips For Newly Self-Published AuthorsMy Profile

  • having these tricky ones written down someplace helps for sure.

  • Perfect timing; I keep running into this at work. I’ve changed that to who too many times. I had to put it in my style sheet.
    Elizabeth West recently posted..News: Bloggers have First Amendment rights tooMy Profile

  • Anne, that’s a great question. It’s restrictive unless only one old man exists. It doesn’t matter whether or not the clause can be removed; the issue is whether or not the clause identifies the subject/object or is just additional information. In this case, it’s not simply “the old man” but “the old man who lives down the street.”

  • Allison, this all makes sense to me EXCEPT in the Specific person, restrictive clause:

    You say “The old man who lives down the street has a beautiful garden.” is restrictive… I don’t see why since it works w/o the clause. What am I missing?


    Anne Wayman
    annew recently posted..Anne’s Writing Credits / ResumeMy Profile

Leave a Comment

CommentLuv badge

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Translate »