source: This has been achieved by a number of organisations, some of which, like the Urdd and the mentrau iaith, are entirely focused on increasing the use of Welsh; 
target: Mae nifer o sefydliadau wedi bod ynghlwm wrth y gwaith hwn – mae rhai ohonynt, fel yr Urdd a’r mentrau iaith, yn canolbwyntio’n llwyr ar gynyddu’r defnydd o’r Gymraeg; 