source: However, we recognise that it is difficult, on the basis of available evidence, to assess the impact of schemes such as these on language patterns in families and that further work remains to be done to better understand the impact of these interventions. 
target: Rydym yn cydnabod, fodd bynnag, ei bod yn anodd, ar sail y dystiolaeth sydd ar gael, i asesu effaith cynlluniau fel hyn ar batrymau iaith mewn teuluoedd a bod rhagor o waith i’w wneud i ddeall yn well effaith yr ymyriadau hyn. 