dubas

There is neither bank nor wall between him and the aforesaid, and it was there that he erected Domhnach-mor-Maighe-Tochair, ribi xl, dubas mansit et Mac

The Most Ancient Lives of Saint Patrick Including the Life by Jocelin, Hitherto Unpublished in America, and His Extant Writings Various

"Kvankam vi estas ricxa, mi dubas, cxu vi estas felicxa", Though you are (in fact) rich, I doubt whether you are (in fact) happy, (ii.).

The Esperanto Teacher A Simple Course for Non-Grammarians Helen Fryer

"Kvankam vi estus ricxa, mi dubas, cxu, vi estus felicxa", Though (supposing that) you were rich,

The Esperanto Teacher A Simple Course for Non-Grammarians Helen Fryer

Mi dubas cxu tia dividado de la tempo inter tago kaj malhela nokto estas agrabla, sed oni povas neniel malhelpi gxin.

A Complete Grammar of Esperanto Ivy Kellerman Reed 1922

"Nenio estas pli facila ol tio," li diris, "kaj nun mi ne dubas cxu mi certe regos super cxiuj regxoj de

A Complete Grammar of Esperanto Ivy Kellerman Reed 1922