Relative clauses are used to give additional information about a noun, such as a person, place or thing. Relative pronouns introduce a relative clause. They include who for people, that and which for ...

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.

(1) a. Everything I don’t eat is food for the dog. b. All I don’t eat is food for the dog. These sentences appear very similar on the surface, but have very different meanings. (1a) means the speaker ...