There are several words that follow the same declension as the indefinite article ‘ein’ :
ein- = a/an
kein- = not a/an/any
mein- = my
dein- = your (informal, singular)
sein- = his/its
ihr- = her/their
Ihr- = your (formal, singular and plural)
unser- = our
euer- = you all’s/y’all’s (informal, plural)
The endings of these ‘ein-Wörter’ are listed below along with the indefinite articles :
As can be seen, the endings of the ‘ein-Wörter’ are all identical to the indefinite article and its endings.
*The possessive pronoun ‘euer’ deletes the second ‘e’ when an ending is added to it.