Cata l an has four relative pronouns. (Unstressed) que and (stressed) qui and que are invariable; the c o m p o u n d el qual (la qual, els quals, les quals) agrees i n number a n d in gender wi th the head n o u n or antecedent to which it refers, confo rming also w i t h its function as relative adjective (see 31.9). Use o f these pronouns is not differentiated i n the same way as Engl i sh 'who ' , ' w h o m ' , 'wh ich ' , 'that'.