Children and young people who are able to speak Welsh are more likely to do so with their friends in school than they are to speak Welsh with friends outside school.
Mae plant a phobl ifanc sy'n gallu siarad Cymraeg yn fwy tebygol o wneud hynny gyda'u ffrindiau yn yr ysgol nag ydyn nhw o siarad Cymraeg â ffrindiau y tu allan i'r ysgol.