Based on the provided image, what is the relationship between adjectives and the suffix '-ness' in English word formation?

Explanation: In English, the suffix '-ness' is added to adjectives to form abstract nouns that denote a state or quality. This is demonstrated by examples such as 'ill' + 'ness' = 'illness', 'dark' + 'ness' = 'darkness', and 'fit' + 'ness' = 'fitness'. The Russian text 'прилагательное + ness = существительное' also indicates that an adjective plus '-ness' equals a noun.