prepositions in relative clauses

In English, we often use prepositions in relative clauses. These include words such as at, on, in, before, and after.^[1]https://www.ef.com/wwen/english-resources/english-grammar/preposition-placement-relative-clauses/

Formal Speech

In formal speech, we place the preposition before the relative pronoun.

For example:

• Is that the person with whom she talked?
• The lawyer with whom we are arguing against is known as the best.
• She liked the roommates with whom she lived.
• The chapel in which they had their wedding was very beautiful.
• That is the car in which he prefers to drive.
• The neighborhood in which we lived was full of mansions.
• The classroom in which we studied was freezing!

As you can see, this sounds rather formal. As such, in informal speech we tend to follow a different pattern.

Informal Speech

In informal speech, prepositions in relative clauses go after the relative clause.

For example:

• Is that the person (who) she talked with?
• The lawyer (who) we are arguing with is known as the best.
• She liked the roommates (that) she lived with.
• The chapel (that) that they had their wedding in was very beautiful.
• That is the car (that) he prefers to drive in.
• The neighborhood (that) we lived in was full of mansions.
• The classroom (that) we studied in was freezing!