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Dependent clauses beginning with the relative pronouns, that, which, or who, are used to describe (or modify) a noun, a phrase, or the entire clause that comes before them. Like all clauses, the adjective clause must have a subject and a verb. The relative pronoun functions as the subject of the clause.
That
• modifies a noun or pronoun that is the subject or object of the main clause
Example:Patients with limited English proficiency were less satisfied with the care that was provided for them.
•Place the adjective clause near the modifies.
•Do not use a comma before an adjective clause that uses "that."
Which
• used when the adjective clause adds additional information about the main clause
• modifies the entire clause that comes before it (not just one word or idea)
Example:A limitation of this study was its restriction to one region of the country, which is not enough to generalize it to a larger population.
•Note that the adjective clause does more than describe a word or idea in the first clause. It is an additional comment.
•Use a comma before an adjective clause that begins with "which."
Who
The pronoun “who” is used when the adjective clause describes a person or people in the main clause. It can modify either the subject or the object of the main clause.
Example A:Job satisfaction is higher in nurses who are led by a transformational leader.
Example B:Nurses who are led by a transformational leader experience higher job satisfaction.
•Place the adjective clause near the word that it modifies.
•The pronoun “who” should be followed by a verb.
Videos
Watch this 9-minute introduction to using relative pronouns.
English With Ashish. (2019, September 2). Relative pronoun -- Which vs that -- Defining and non-defining clause -- Relative clause [Video]. YouTube. https://www.youtube.com/watch?v=imEtjZ1EgOI
Watch this 19-minute extended lesson on using relative pronouns.
LetThemTalkTV. (2021, April 17). Relative pronouns -- That, which, who(m), whose, where, when or nothing? -- Explained with donuts [Video]. YouTube. https://www.youtube.com/watch?v=meEVMzel0kQ