Non-restrictive definite clauses and restrictive definite clauses are two different types of definite clauses that have some differences in grammatical structure and usage.
Restrictive relative clauses:
What it does:A restrictive definite clause restricts the antecedent and provides the necessary information in order to determine the identity of the antecedent.
Conjunction:Relative pronouns (who, whom, whose, which, that) or relative adverbs (where, when).
Comma:Do not use a comma to separate it from the main clause.
Examples:the book that is on the table is mine.(The book on the table is mine.) ）
Non-restrictive relative clauses:
What it does:Non-restrictive definite clauses provide additional information about the antecedent, but this part of the information is not necessary and can be omitted without affecting the overall meaning of the sentence.
Conjunction:Relative pronouns (who, whom, whose, which) or relative adverbs (where, when).
Comma:Use a comma to separate it from the main clause.
Examples:my sister, who is a doctor, lives in new york.(My sister, who is a doctor, lives in New York.) ）
Overall, the difference is that a restrictive definite clause provides the necessary restriction on the antecedent, while a non-restrictive definite clause provides additional clarification and is not necessary information. The use of commas is a key to judging the relationship between them.
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