連上代詞 RELATIVE PRONOUN

qui quae quod [who, which, that]

單數	陽類	陰類	中類
主格	qui	quae	quod
屬格	cuius	cuius	cuius
與格	cui	cui	cui
賓格	quem	quam	quod
奪格	quo	qua	quo

複數	陽類	陰類	中類
主格	qui	quae	quae
屬格	quorum	quarum	quorum
與格	quibus	quibus	quibus
賓格	quos	quas	quae
奪格	quibus	quibus	quibus

The gender and number of a relative pronoun are determined by its antecedent, the case, however, by its use in its own clause.
vir qui librum tibi dedit te laudavit. [The man who gave you the book praised you.]
vir cuius librum Caecilius tibi dedit te laudavit. [The man whose book Caecilius gave you prasied you.]
vir cui Caecilius librum dedit te laudavit. [The man to whom Caecilius gave the book praised you.]
femina quam laudas est docta. [The woman whom you are praising is talented.]
homo de quo dicebas est amicus carus. [The man about whom you were speaking is a dear friend.]

疑問形容詞 INTERROGATIVE ADJECTIVE

qui quae quod [what? which? what sort of?].

Its forms are identical to those of the relative pronoun, except that quis is occasionally substituted as the nominative singular of qui and quae.

qui venti cursum tibi dederunt? [Which winds gave you your course?]
cuius libri fuit Cicero auctor? [Of which gook was Cicero the author?]
cui amico librum dederunt? [To which friend did they give the book?]
quem librum tibi dedit? [Which book did he give you?]
quod praemium dedit? [What reward did he give?]