Grammatical gender manifests itself when words related to a noun like determiners, pronouns or adjectives change their form ("inflect") according to the gender of noun they refer to ("agreement"). The parts of speech affected by gender agreement, the circumstances in which it occurs, and the way words are marked for gender vary between languages. Gender inflection may interact with other grammatical categories like number or case. In some languages the declension pattern followed by the noun itself will be different for different genders.