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The relative pronouns are semantically and formally related to the interrogative pronouns, the difference being in their function: the relative pronouns are used to link two clauses into one compound sentence and not to form questions.
Basic relative pronouns are made by adding the -ž suffix at the end of a corresponding interrogative pronoun, whatever declensional form it may have, ex.:
Another set of relative pronouns with a generalised meaning (roughly corresponding to the English pronouns whatever, whoever etc.) is formed by adding the -kuli suffix to the basic relative pronoun form, ex.:
| interrogative | basic relative | generalised relative |
| štó | štóž | štóžkuli |
| koho | kohož | kohožkuli |
| komu | komuž | komužkuli |
| kajki | kajkiž | kajkižkuli |
| kajka | kajkaž | kajkažkuli |
| kajke | kajkež | kajkežkuli |
See the below sentences and compare the usage of the corresponding interrogative and relative pronouns.
| Koho | sy | přeprosył? |
| who Acc. | be 2.sing.pres. | invite past.part. masc.sing. |
| direct object | compound verb | |
| Who have you invited? | ||
| Přeprosył | sym, | kohož | sym | chcył. |
| invite past.part. masc.sing. | be 1.sing.pres. | who-relative Acc. | be 1.sing.pres. | want past.part. sing.masc. |
| compound verb | direct object | compound verb | ||
| I’ve invited whom I wanted [to invite]. | ||||
| Přepros, | kohožkuli | chceš. |
| invite 2.sing.imper. | who-gener.relat. Acc. | want 2.sing.pres. |
| verb | subject | verb |
| Invite whoever you want. | ||