For the imperative form, the second-person singular, Turkish uses the bare verb stem without the infinitive ending "-mek"/"-mak". Other imperative forms use various suffixes. The second-person plural, which can also be used to express formality (See T–V distinction), uses the suffixes "-in/-ın/-ün/-un". The second person double-plural, reserved for super formal contexts (usually public notifications), uses the suffixes "-iniz/-ınız/-ünüz/-unuz". Third-person singular uses "-sin/-sın/-sün/-sun". Third-person plural uses "-sinler/-sınlar/-sünler/-sunlar" (There is no third person double-plural in Turkish). First-person pronouns do not have imperative forms. All Turkish imperative suffixes change depending on the verb stem according to the rules of vowel harmony. For the verb "içmek" ("to drink", also "to smoke" a cigarette or similar):