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I know as much about video games as you know about chemistry.
I know as much about video games as you do about chemistry.
I know as much about video games as you do chemistry.
Are all three sentences grammatically correct? As a non-native speaker, I find the 3rd sentence a bit odd. I don't think it's grammatically incorrect, but I'd prefer the second sentence to this one. Which of these sentences would you prefer?
It's more a question of whether they are idiomatic than whether they are grammatically correct. I find the second more natural than the first. The third doesn't really work; it makes do stand in for too many words.
