I have a wonderful TA, and he has a cockney accent. He talks to the children with horrible grammar, e.g., "There wasn't nuffingk here.". The children can comprehend what he's saying, and I worry that it will translate into their own speech patterns and eventually, their writing. I would like to explain to the children that the way we speak is not the way we write if we want to be grammatically correct, but I fear that my TA may feel belittled or embarrassed. I know that dialects and class are touchy subjects. What do you recommend I do?