Adjective Clause
The useful reader task is recognizing noun-modifying relative clauses and deciding whether the information is defining or supplementary. Terminology varies across grammar frameworks, so the guide treats adjective clause as a teaching label rather than the only valid analysis.
“Adjective clause” is a traditional teaching label for a relative clause that modifies or identifies a noun or noun phrase. In modern descriptions, “relative clause” is usually the clearer umbrella term, with defining and non-defining forms behaving differently.
Key details
Important caveats
Boundary
Do not claim that every framework treats all relative clauses simply as adjectives. Use “relative clause” when a terminology-neutral description is preferable.
Further guidance
Defining Vs Nondefining
Defining relative clauses restrict the reference; non-defining clauses add supplementary information and normally use different punctuation.
Diagnostic
Find the noun or noun phrase being identified or described, then test whether the following clause supplies that information.
Worked Example
In “The report that arrived yesterday is final,” “that arrived yesterday” identifies which report is meant, so it is a defining relative clause traditionally called an adjective clause.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Relative clauses (opens in a new tab)Cambridge University Press · Cambridge explains that relative clauses describe or identify a noun or noun phrase, which is the core function traditionally described by the label adjective clause.
- Relative clauses: defining and non-defining (opens in a new tab)Cambridge University Press · Cambridge distinguishes defining and non-defining relative clauses, their information roles, pronoun choices, and punctuation, providing the necessary boundary for an adjective-clause guide.