DD is 6 (year 1) and is very bright and doing extremely well at school in bith Maths and reading / writing. However, her spoken grammar is that of a much younger child. She seems completely unable to get irregular verbs or unusual plurals e.g. she'll still say "I runned after him", "Mummy buyed it" or "two mouses". She's very good at recognising patterns so I wonder if she basically just does this in speech rather than copying. We've tried repeating the phrase casually back to her with the correct word, and if you pull her up on it she can usually correct herself, but it just doesn't seem to be getting any better. Her sister is not as academic as she is, but pretty much never made gramatical errors even when much younger. Does anyone have any experience, thoughts or ideas on this? I'm not really worried and certainly don't want to make her self conscious, but wonder at what point I need to take it a bit more seriously (if at all).