We have some of the strongest dialects in the country, but that isn't stopping a head teacher from Teesside taking one of them on.
Sacred Heart Primary in Middlesbrough has written to parents asking them to correct their children's English.
They say that telling pupils when - and when not - to use their dialects, will help them in the future.
Watch the full report from Dan Ashby below.
Parents at a Middlesbrough primary school have been sent a letter from the head teacher advising them on correcting their children's Teesside accents.
Pupils at Sacred Heart Primary School have been sent home with a list of 11 words or phrases which can cause problems with grammar or pronunciation.
Head teacher Carol Walker has placed the word "Yous" firmly in detention, explaining "the word you is NEVER a plural."
Mrs Walker, born in Stockton and head at the urban primary for 12 years, stressed the aim was not to wipe out the Teesside accent but to teach children standard English.
She wanted pupils to avoid being at a disadvantage in later life, especially in the jobs market, where those who cannot communicate clearly can struggle.
To back up efforts at school, she decided to write to parents asking for their help at home, and the response has been "really positive".
– Carol Walker, Head teacher
"We have not had any negative reaction at all.
It's about knowing when it is appropriate to use one voice rather than another.
I am not asking children to deny where they come from, I am saying to them there are certain situations where they need to be able to use standard English."
Parents of children who attend the Sacred Heart Primary school in Teesside have received letters asking them to look out for their children's mispronunciations and slang.
Examples include "gizit here" instead of "give it here" and "nowt" instead of "nothing"