Compare school experiences: possessive adjectives 'unser' and 'ihr'

[er] is usually stressed when it's part of the first syllable of a word or a single syllable word e.g. Herz, er, lernen. [er] is most often unstressed when it is is at the end of a word e.g. Bruder. Adding the suffix -heit to certain (though not all) adjectives creates nouns, usually meaning adjective + -ity or -ness. 'Unser' and 'ihr' are possessive adjectives; 'unser' means 'our' and 'ihr' means 'their'. Possessive adjectives 'unser' and 'ihr' change their spelling to agree with gender of the noun and the case.