adjectives following conjugations of być
Something I need to remember is that although you use the instrumental case following conjugations of być. This only applies to adjectives if they describe a noun following conjugations of być. To illustrate: He is a man - On jest mężczyzną the noun mężczyzna, because it follows jest, takes the instrumental form: mężczyzn ą. If we add an adjective, its case must be the same as the noun, so he is a happy man - on jest szczęśliwym mężczyzną [instrumental] he is a happy guy - on jest szczęśliwym facetem [instrumental] However, if we do not have a noun after conjugations of być and just use an adjective, then the adjective stays in the nominative case. he is happy - on jest szczęśliwy [masculine nominative] Not forgetting to get the gender correct. she is happy - ona jest szczęśliwa [feminine ...