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Oh... I didn't know. Thank you.

This is exactly what I mean :)[/quote]

"Not at all" means не совсем. You probably meant "not entirely"-не вполне. And in this case I would say "[b]That's[/b[ exactly what I mean," although "this"...

This is exactly what I mean :)

Because сколь is archaic. :wink:[/quote]
Well, not at all...

Do you mean сколько?

I think you could also say "Насколько ты знаешь русский язык?"[/quote]
Maybe "Насколько хорошо ты знаешь русский язык". Without "хорошо" it sounds a bit weird for me.
...

Such a simple sentence unexpectedly confused me very much. I have got some variants ("how much are you skilled in Russian", "how well do you know Russian") but they seem to me either awkward or...