Relative pronouns...que, quien

Question 1

when do you use quien?

Answer 1

Referring to a person and a preposition is used

Question 2

Julia, who was not there that day, was the leader of the group

Answer 2

julia, quien no estuvo ese día, fue el líder del grupo.

I think this could be que too

Question 3

I don´t the man he was talking about.

Answer 3

no conozco al hombre de quien hablaba

Question 4

Laura read the book that she bought.

Answer 4

Laura leyó el libro que compró.

Question 5

my car, which is parked there, is blue

Answer 5

Mi coche, que está estacionado allí, es azul.

Question 6

This is the article that I spoke to you about

Answer 6

Este es el artículo de que te hablé.

Question 7

I saw the man who was here yesterday.

Answer 7

Vi al hombre que estaba aquí ayer.