Using “Who,” “That,” and “Which” Correctly

Use who when introducing a clause that describes or modifies people.

Use that when introducing a clause that describes or modifies objects or non-human things.

Use which when introducing a clause that describes or modifies objects.

“Who,” “That,” and “Which”

Do you know whether to fill in the blank with who, that, or which?

The answer is who.

If you didn’t answer correctly, don’t worry. We’re here to put an end to the confusion behind the relative pronouns who, that, and which.

To begin, relative pronouns connect noun phrases to a relative clause that modifies or describes it. Consider the following example:

Here, that connects the noun phrase (the cake) to the relative clause (Alison baked was delicious). Who, whom, whose, which, and that are all relative pronouns.

The type of relative pronoun used depends on the noun phrase (antecedent) and the relative clause that’s modifying it. A non-restrictive clause (non-essential or non-defining) is usually preceded by a comma, whereas no comma is needed before restrictive clauses (essential or defining).

LanguageTool’s Grammar Checker can fix mistakes in sentences containing relative pronouns.

Using “Who” as a Relative Pronoun

Use who as a relative pronoun when connecting it to a relative clause that describes a person or a group of people. Who can be used in both restrictive (defining) and non-restrictive (non-defining) clauses.

In this example, who has diabetes is not essential to the sentence. In other words, the sentence still makes sense even if it’s removed.

Here, the clause sells the most tickets is restrictive because it cannot be removed from the sentence without changing the meaning.

Using “That” as a Relative Pronoun

Some writers mistakenly use that in place of who. You may have even come across a text in which that to introduce a clause that describes people, but this is considered colloquial or informal. Keep this in mind: that is used for objects and non-human things.

That is also only used for restrictive clauses and therefore doesn’t require a comma. Consider the following examples:

Using “Which” as a Relative Pronoun

Because which is also used to introduce a clause that describes objects, it’s often incorrectly used in place of that (or vice-versa). Which is used to introduce a non-restrictive clause and therefore requires a comma before and after.

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We only focused on the relative pronouns who, that, and which, and still, we covered a lot of ground. Here are the most important points to remember if you want to make sure to use them correctly: