Idem, the same. 
SINGULAR.  PLURAL. 
MASCULINE.  FEMININE.  NEUTER.  MASCULINE.  FEMININE.  NEUTER.
Nom. idem eadem idem eidem, eaedem eadem
iidem
Gen. ejusdem ejusdem ejusdem eorundem earundem eorundem
Dat. eidem eidem eidem eisdem eisdem eisdem
Acc. eundem eandem idem eosdem easdem eadem
Abl. eodem eadem eodem eisdem eisdem eisdem

The Nom.  Plu.  Masc. also has idem, and the Dat.  Abl.  Plu. isdem or iisdem

* * * * *

V. THE INTENSIVE PRONOUN.

88.  The Intensive Pronoun in Latin is ipse.  It corresponds to the English myself, etc., in ‘I myself, he himself.’

SINGULAR                          PLURAL. 
MASCULINE.   FEMININE.   NEUTER.     MASCULINE.   FEMININE.   NEUTER.
Nom.  ipse        ipsa       ipsum      ipsi        ipsae      ipsa
Gen.  ipsius      ipsius     ipsius     ipsorum     ipsarum    ipsorum
Dat.  ipsi        ipsi       ipsi       ipsis       ipsis      ipsis
Acc.  ipsum       ipsam      ipsum      ipsos       ipsas      ipsa
Abl.  ipso        ipsa       ipso       ipsis       ipsis      ipsis

* * * * *

VI.  THE RELATIVE PRONOUN.

89.  The Relative Pronoun is qui, who.  It is declined:—­

SINGULAR                          PLURAL. 
MASCULINE.   FEMININE.   NEUTER.     MASCULINE.   FEMININE.   NEUTER.
Nom.  qui         quae       quod       qui         quae       quae
Gen.  cujus       cujus      cujus      quorum      quarum     quorum
Dat.  cui         cui        cui        quibus[26]  quibus     quibus
Acc.  quem        quam       quod       quos        quas       quae
Abl.  quo[27]     qua[27]    quo        quibus[26]  quibus     quibus

* * * * *

VII.  INTERROGATIVE PRONOUNS.

90.  The Interrogative Pronouns are quis, who? (substantive) and qui, what? what kind of? (adjective).

1.  Quis, who?

                    SINGULAR.  PLURAL. 
          MASC.  AND FEM.  NEUTER
  Nom. quis quid The rare Plural
  Gen. cujus cujus follows the declension
  Dat. cui cui of the Relative Pronoun.
  Acc. quem quid
  Abl. quo quo

2.  Qui, what? what kind of? is declined precisely like the Relative Pronoun; viz. qui, quae, quod, etc.

  a.  An old Ablative qui occurs, in the sense of how? why?

  b.  Qui is sometimes used for quis in Indirect Questions.