Przysłówki względne where, when oraz why mogą służyć do łączenia zdań lub zdań składowych. Zastępują bardziej formalną strukturę, przyimek + which, która służy do wprowadzenia zdania względnego.
| Struktura formalna, przyimek + which | Bardziej powszechna struktura wykorzystująca przysłówek względny |
|---|---|
| That's the restaurant in which we met for the first time. | That's the restaurant where we met for the first time. |
| That picture was taken in the park at which I used to play. | That picture was taken in the park where I used to play. |
| I remember the day on which we first met. | I remember the day when we first met. |
| There was a very hot summer the year in which he was born. | There was a very hot summer the year when he was born. |
| Tell me the reason for which you came home late. | Tell me (the reason) why you came home late. |
| Do you want to know the reason for which he is angry with Sally? | Do you want to know (the reason) why he is angry with Sally? |