[Lauren]

They have a pretty sound grasp of the English Language if you ask me. Those people saying they need English lessons, please, point out in which area do they need these lessons, providing examples?

And Leigh, (not meaning to single you out, just using your example to prove my point), they say the word "deffo" - although thats not listed prescriptively in the Oxford English Dictionary, it's a standard feature of spoken English. It's not incorrect, it's not "non vocabulary" - it's spoken language which leaves windows of error open for such features.