I was wondering, how many of us differentiate between 'can' and 'may'? I've noticed that I tend to always say 'can' when I really mean 'may' e.g. "please can I have a cup of tea?" Do you think that it matters? I'd hate my child to start school and be considered rude by always asking for things using 'can', but I'm worried that if I start trying to use 'may', I'll do it inconsistently and then confuse him.
Re-reading this post I wonder if worrying about this just means I have too much time on my hands!