Look at these Spanish examples:
La universidad para la que trabajé es bastante famosa.The university which I worked for is quite famous.
The relative pronouns el que, la que, los que and las que must agree with the word that precedes them. They can be used to refer to both people and things.
Note that (with most prepositions) we sometimes drop the article when talking about things:
El vestido con el que fui al baile era rojo. (correct)
El vestido con que fui al baile era rojo. (correct)
However, if we talk about people, we need to keep the article:
El hombre para el que trabajaba era muy rico. (correct)
El hombre para que trabajaba era muy rico. (incorrect)
The man he worked for was very rich.
Note that if you refer to people, you can also use the relative pronoun quien/quienes:
It's important to note that the slightly more formal relatives "el cual, la cual, los cuales, las cuales" can also be used with prepositions exactly the same way as we showed above. But remember that in this case you need agreement in gender and number. For example:
El artículo en el cual estoy trabajando ahora va a publicarse dentro de 3 días.The article I'm working on now is going to be published in 3 days.
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Examples and resources
Los abogados con quienes hablé parecían muy profesionales.The solicitors I spoke with seemed very professional.
El artículo en el que estoy trabajando ahora va a publicarse dentro de 3 días.The article I'm working on now is going to be published in 3 days.
Subimos hasta la cima de la montaña, desde la que pudimos admirar toda la ciudad.We went up to the top of the mountain, from where (from the top of which) we could admire the whole city.
Los estudiantes con los que salí de fiesta eran muy simpáticos.The students who I partied with were very nice.
El hombre para el que reservé el hotel estaba muy contento.The man who I booked the hotel for was very happy.
Los hoteles en los que te alojaste eran de cinco estrellas.The hotels which you stayed in had five stars.
El artículo en el cual estoy trabajando ahora va a publicarse dentro de 3 días.The article I'm working on now is going to be published in 3 days.
La universidad para la que trabajé es bastante famosa.The university which I worked for is quite famous.
Los chicos para los cuales reservé el hotel estaban muy contentos.The boys who I booked the hotel for were very happy.
Las zapatillas con las que ella hizo deporte no eran muy cómodas.The trainers which she exercised in were not very comfortable.
