[Nightedge]

When I was very young, I heard my teachers say that in the UK, dialects existed; and in these dialects 'he don't know' is correct and possible. When there's so much difference, recognised upon hearing, between 'he don't' and 'he doesn't', there are people in the UK who would still say 'he don't', which deviates a good deal from the standard language. Then is it correct to say that in modern standard English it is wrong to say 'in Sunday', but correct in dialects? I've googled but dialects seem to be so uninterested a subject that no authority has published things online. Are there any online resources we can use to understand how the language is really used by people in the UK or in England?