Couldn't it also be "Why are you THAT fast"?
Same doubt here
Is this not English: "Why are you fast like that?"
I could imagine hearing this itialoo - though its not as natural as ""Why are you so fast?" (native speaker)
why can't it be rapida?
perche sei rapida was matked as being incorrect, but apparently it can be rapido or rapida. I
It could be.