An essential relative clause provides necessary, defining information about the noun. On the other hand, non‐ essential relative clauses provide additional, non‐necessary information about the noun.

The words ‘who’, ‘whom’, ‘which’, ‘whoever’, ‘whomever’, ‘whichever’, and ‘that’ are known as relative pronouns in the English language. A relative pronoun connects a phrase to a noun or pronoun. Thus ...

In English, relative pronouns are words such as that, who and which. In English relative pronouns. can be left out of the sentence but they must always be used in ...