Is there a way to know when non-defining relative clauses can be reduced and when they can't?
Can you give an example of a reduced relative clause vs a non-reduced relative clause?
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Can you give an example of a reduced relative clause vs a non-reduced relative clause?
Some types of relative clauses can be “reduced”— the relative pronoun and maybe other words can be removed. You might reduce the clause to make your writing more concise or to add sentence variety.
Rest
The crucial property of relative clauses is that they contain an element - actually present or understood - that is anaphorically related to an antecedent from which it derived its interpretation.
If the relativised element is dropped the clause can no longer be called a relative clause - it may still be a modifier, but it's a different kind of clause, a non-finite one. Compare:
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