Non-defining relative clauses | English grammar rules

Non-defining relative clauses give us more non-essential information about a noun. They are also known as non-restrictive relative clauses and they are particularly common in written English. We must use commas when writing them to separate them from the rest of the sentence. Relative pronouns link them to the noun that they are referring to. The relative pronoun cannot be omitted. It is compulsory. Finally, we cannot replace “who“, “whom“ or “which“ with “that“. You will also learn the grammar rules fo