Final answer:
Non-restrictive clauses require commas and provide additional information without narrowing down the meaning of the noun.
Explanation:
Non-restrictive clauses provide supplementary information and are always enclosed by commas. They do not narrow down the meaning of the noun.
For example, in the sentence: 'All politicians, who are crooks, should be jailed,' the non-restrictive clause 'who are crooks' is set off by commas.
Remember, non-restrictive clauses need commas while restrictive clauses do not.
Learn more about Non-restrictive and restrictive clauses here:
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