The Welsh Government has commissioned the Office for National Statistics to carry out a Welsh Language Use Survey from July 2019 to March 2021.
Mae Llywodraeth Cymru wedi comisiynu’r Swyddfa Ystadegau Gwladol (SYG) i gynnal Arolwg Defnydd Iaith o Gorffennaf 2019 i mis Mawrth 2021.