Declination with German possessive pronouns

Possessive adjectives, also known as possessive pronouns (in English my, our, his, etc.) are available in German based on the case in which their declension is. They also agree in gender and number with the nouns to which they refer, with the result that many opportunities arise where you will need to know the following:

Possessive adjectives with a singular noun

First Person Masculine Feminine Neutral Plural
Nominative mein meine mein meine
Accusative meinen meine mein meine
Dative meinem meiner meinem meinen
Genitive meines meiner meines meiner

Second Person Masculine Feminine Neutral Plural
Nominative dein deine dein deine
Accusative deinen deine dein deine
Dative deinem deiner deinem deinen
Genitive deines deiner deines deiner

Third Person Masculine Feminine Neutral Plural
Nominative sein/ihr seine/ihre sein/ihr seine/ihre
Accusative seinen/ihren seine/ihre sein/ihr seine/ihre
Dative seinem/ihrem seiner/ihrer seinem/ihrem seinen/ihren
Genitive seines/ihres seiner/ihrer seines/ihres seiner/ihrer

Possessive adjectives with a plural noun

First Person Masculine Feminine Neutral Plural
Nominative unser unsere unser unsere
Accusative unseren unsere unser unsere
Dative unserem unserer unserem unseren
Genitive unseres unserer unseres unserer

Second Person Masculine Feminine Neutral Plural
Nominative euer eure euer eure
Accusative euren eure euer eure
Dative eurem eurer eurem euren
Genitive eures eurer eures eurer

Third Person Masculine Feminine Neutral Plural
Nominative ihr ihre ihr ihre
Accusative ihren ihre ihr ihre
Dative ihrem ihrer ihrem ihren
Genitive ihres ihrer ihres ihrer
In the third person singular, the gender of the owner is the determinant in the choice between sein and ihr.
  • Mein Mann hat drei Autos, sein Bruder hat vier.
    My husband has three cars, his brother has four.
  • Meine Frau hat drei Autos, ihr Bruder hat vier.
    My wife has three cars, her brother has four.

Formal possessive adjectives

First Person Masculine Feminine Neutral Plural
Nominative Ihr Ihre Ihr Ihre
Accusative Ihren Ihre Ihr Ihre
Dative Ihrem Ihrer Ihrem Ihren
Genitive Ihres Ihrer Ihres Ihrer

Make sure to remember the capitalization for this form! Additionally, formal adjectives remain the same both in the singular and in the plural, so you don't have to remember any beyond those above.