Restrictive and non-restrictive phrases or clauses modify nouns differently in a sentence.
Restrictive and non-restrictive phrases or clauses provide essential or additional information about a noun.
Restrictive phrases or clauses are necessary and not set off by commas, while non-restrictive phrases or clauses are supplementary and enclosed by commas.
In the sentence provided, 'Students who purchase parking spots' is a restrictive phrase as it is crucial for defining which students can park in the closest lot.
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