Relative pronouns

That, when, where, which, who, whose:

We use relative pronouns to add a new clause (the relative clause) to sentence. We choose a relative pronoun that refers to the noun before the relative clause.

We use who and that to refer to people (The girl who/that works ate the library is very friendly).

We use which and that to refer to things (School is the place which/that gives you an education).

We use when to refer to time (There are times when my mind goes completely blank during his lessons).

We use where to refer to spaces and places (You need to find a room where you can study properly).

We use whose to express possession (There isn't anyone in the class whose marks are worse than mine).