Relative Pronouns of Place and Time
Pronouns are words used to avoid repetitions of a noun {see Subject Pronouns, A1 Level}. Relative pronouns are used to introduce relative clauses. They refer to place and time by replacing the subject expressed in the main clause to avoid the repetition of it in the relative clauses {see Relative Pronouns, A1 Level}. https://open.books4languages.com/english-a2-grammar/chapter/relative-pronouns-of-place-and-time/