# requiredKeysForLanguage: Returns a collection of the custom pronoun keys required by this language. ``` + (NSArray *) requiredKeysForLanguage:(NSString *) language; ``` ## Parameters `language` The language to create a custom pronoun for. ## Return Value The keys required for the given language. ## Discussion If any of the required keys for a given language are unset, calling [`setCustomPronoun:forLanguage:error:`](/documentation/Foundation/NSMorphology/setCustomPronoun:forLanguage:error:) for that language with an incomplete [`NSMorphologyCustomPronoun`](/documentation/Foundation/NSMorphologyCustomPronoun) results in an error. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)