Material Unit 2

We can put prepositions before relative pronouns (more formal) or at the end of relative clauses (more informal).

Examples:  This is the city in which my mum was born. (formal)

                   This is the city which/ that my mum was born in. (informal)

When we use a preposition before who, it becomes whom.

Example: Do you know Jack,  with whom I went to school? (formal)

                Do you know Jack, who I went to school with? (informal)