Rhymes: -ʉː Pronoun []. du. you (familiar sg.; thou; Usage notes []. While du is the traditionally familiar mode of address, it is since the early ’70s the standard in almost all circumstances, possibly capitalized in formal communications. This was the result of the so-called du-reformen.. Recently, use of the second-person plural pronoun ni as a less familiar (and thus more formal) pronoun …

