The Welsh Language Use Survey 2019 to 2020 is a continuation of research undertaken jointly by the Welsh Language Commissioner and the Welsh Government in 2013 to 2015.
Mae Arolwg Defnydd Iaith 2019 i 2020 yn barhad o ymchwil a wnaed ar y cyd gan Gomisiynydd y Gymraeg a Llywodraeth Cymru yn 2013 i 2015.