Relative Clauses Questions Medium
Relative clauses are punctuated differently depending on whether they are defining or non-defining.
Defining relative clauses provide essential information about the noun they modify and are not separated by commas. They are necessary to understand the meaning of the sentence. For example: "The book that I borrowed from the library is very interesting."
Non-defining relative clauses provide additional, non-essential information about the noun they modify and are separated by commas. They can be removed from the sentence without changing its meaning. For example: "My sister, who is a doctor, lives in London."
In summary, defining relative clauses are not separated by commas, while non-defining relative clauses are separated by commas.