An example of a restrictive element is a comma.
What is restrictive?
A restrictive clause makes a significant modification to the noun that comes before it. Such nouns are limited or identified by restrictive clauses, which cannot be removed from the a sentence without altering its meaning. On the other hand, a nonrestrictive clause only briefly describes a noun. Let's clear up the terminology first because it can be difficult to understand in this area of grammar. Restrictive clauses are frequently referred to as essential clauses because they contain crucial identifying information, while nonrestrictive clauses are known as nonessential clauses again for opposite reason. Because the information those who provide relates to a subject of another clause, they are both examples of relative clauses.
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