Re: "Even you should do it."

Originally Posted by
philo2009
Indeed it is, but not here!
'Only' is classified as an adjective only when it has the meaning 'sole' and functions as a modifier within a noun clause, e.g. an only child, the only problem.
But that's exactly what it means here.
You are the sole person who can do it. You are alone in the class of people who can do it.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.