I dunno the answers to any of those questions, and you dunno and he dunno either.
Fer, as the poit sez, me 'eart 'as got / The pip wiv yearnin' fer - I dunno wot. 1915, C.J. Dennis, The Songs of a Sentimental Bloke, published 1916, page 13:
th มะรุ (do (does) not know) · id entah (do (does) not know) · fi ei tiiä (do (does) not know) · nl weet ik niet (do (does) not know) · hu gőzöm sincs (do (does) not know) · ms entah (do (does) not know) · ms tak tau (do (does) not know) · ru не зна́ю (do (does) not know) · ru неизве́стно (do (does) not know) · mi aua hoki (do (does) not know) · sk neviem (do (does) not know) · mr माहीत नाही (do (does) not know) · es sepa (do (does) not know) · hu nemtom (do (does) not know) · fr chais pas (do (does) not know) · ru не знать (do (does) not know) · mi e aua hoki (do (does) not know) · he לוידע (do (does) not know) · ms tak tahu (do (does) not know) · nl kweetniet (do (does) not know) · it boh (do (does) not know) · fr chépa (do (does) not know) · sv vene (do (does) not know) · la nesciō (do (does) not know) · es sabí (do (does) not know) · ja 分からん (do (does) not know) · cy dwn i ddim (do (does) not know) · cy dwn i'm (do (does) not know) · pl nie wiem (do (does) not know) · pt sei lá (do (does) not know) · ja 知らん (do (does) not know) · de weiß nich (do (does) not know) · mi aua (do (does) not know) · sv venne (do (does) not know) · uk не знаю (do (does) not know) · nl kweenie (do (does) not know) · cmn 不知道 (do (does) not know) · gd chan eil fhios a'm (do (does) not know) · sv vet inte (do (does) not know) · pl nie wie (do (does) not know) · pl nie znam (do (does) not know)