Question

Necesito saber oraciones subordinadas con who, whom y which

Answer 1

1. who – se utiliza para personas: 

The man who lives on the second floor is a doctor.

The girl who works at the supermarket is ill.

2. which – se utiliza para objetos / animales: 

The book which you gave me is interesting.

The dog which is always barking is called Bobby

The pen which you gave me doesn't work 

3. whom – puede sustituir a who cuando este cumple una función de complemento en la frase relativa. También puede ser omitido:

The man (who / whom) you saw is my brother

The people with whom I work are always late 

Importante:  whom es la única opción cuando el pronombre va precedido por una preposición.

The man to whom you spoke is my brother. (Y no: The man to who you spoke …)

Espero haberte ayudado :)