Welsh speakers who said that they usually choose mainly, almost always or always English in any of these situations were asked why.
O ran y siaradwyr Cymraeg a ddywedodd eu bod fel arfer yn dewis Saesneg yn bennaf, bron bob amser neu bob amser mewn unrhyw un o'r sefyllfaoedd hyn, gofynnwyd iddynt egluro pam.