A sentence with a restrictive clause provides necessary information to define the noun, while a non-restrictive appositive offers extra, nonessential details.
Restrictive clause: The sentence includes a restrictive clause as the phrase 'who were lucky' is essential for understanding which children received presents. This type of clause narrows down or restricts the meaning of the noun.
Non-restrictive appositive: An example of a non-restrictive appositive would be 'The children, who were lucky, received presents.' The phrase 'who were lucky' provides supplementary information and is enclosed by commas since it does not narrow down the meaning of the noun.
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