First declension nouns

Neuter stems in г, к, х

Singular Plural
Nominative благо блага
Accusative благо блага
Genitive блага благ
Prepositional благе благах
Dative благу благам
Instrumental благом благами

Although a few nouns follow this pattern, the majority of nouns whose nominative singulars end in -го are borrowed from foreign languages and are indeclinable, e.g. динго, манго. Of the nouns that end in -ко in the nominative singular, a huge number have an irregular nominative plural in -и, e.g. nom sg местечко becomes nom pl местечки, and a few have an irregular genitive plural in -ов, e.g. nom sg облако becomes gen pl облаков; the student should always look them up in the dictionary the first time they are encountered.