In English, demonstratives are words like “this” and “that”.

The declension of masculine singular “this” is as follows:

Nom : hic

Gen : huius

Dat : huic

Acc : hunc

Abl : hōc

Voc : –

The declension of masculine plural “this” is as follows:

Nom : hī

Gen : hōrum

Dat : hīs

Acc : hōs

Abl : hīs

Voc : –

The declension of masculine singular demonstrative “that” is :

Nom : ille

Gen : illīus

Dat : illī

Acc : illum

Abl : illīs

Voc : –

The declension of masculine plural demonstrative “that” is:

Nom : illī

Gen : illōrum

Dat : illīs

Acc : illōs

Abl : illā

Voc : –