I very rarely correct my girls use of English, and I never laugh because my Thai is non-existent so she is way ahead of me, some things do make me smile though.
Instead of 'I don't know' she will say 'I dint know', and for some reason it sounds pretty cute. Also, she refers to dumb people as 'not full bob you know?' which is so good I have adopted it.
Some words she has spot on are 'shopping', 'lottery', 'credit card' and 'no way'.
