Reduced relative clauses make noun phrases shorter and more formal.
Use an -ing form for active meanings and a past participle for passive meanings.
Use a to-infinitive after ordinal numbers, superlatives, and expressions such as the next, the only, or the first.
| Use | Pattern | Example |
|---|---|---|
| Core form | Noun + -ing phrase | The people waiting outside looked anxious. |
| Variation | Noun + past participle phrase | The documents submitted yesterday were incomplete. |
| Advanced form | Noun + to-infinitive | She was the first person to raise the issue. |
Only reduce a relative clause when the meaning remains clear.
Do not reduce non-defining relative clauses if the result sounds unnatural or ambiguous.