I put "You speak very fast" which was not accepted. I'm curious why not. Again, obviously, we're NOT learning English here and sometimes we go trotting down the wrong line of questioning vs. dealing with the CZECH of it. But it seems it's very "ballpark" to use an Americanism.
I'm not sure what Americanisms you mean this time, I don't see any.
There is a difference in meaning between "dost" and "very". We accept quite, rather, pretty, and fairly here, you can choose among those. "You speak very fast" would be "velmi rychle", "hodně rychle" or even "moc rychle".
Dekuji. That's what I needed to know. So those adverbs are indeed that specific. FYI, "ballpark" in the States means "In the ballpark" meaning "in the general vicinity of/fairly close/somewhat synonymous to". For instance if you were a house painter and someone asked you how much to paint their house, you might respond "Ballpark? $10,000-$12,000". All of you seem to have such an astonishing command of English that I sometimes forget to check myself.
Oh, sorry, I believe I misread your original comment - I thought you meant there was something American in the usage of "You speak very fast". My bad! (to use an Americanism, too :))
I've heard the expression ballpark, although not quite exactly as in your example, more like "It costs 115, my guess was 100, so I was in the ballpark." Okay, you could say using "very" here for "dost" is in somewhere in the ballpark, but we have to draw the line somewhere so that people don't learn the wrong words - it's often better to err on the side of accuracy not to mislead anyone. Otherwise we could as well gradually increase the size of these ballparks and then accept "stool" for "table", because a stool is sort of a small table, isn't it? :)