It is imperative that you — there in person.
Explanation: The word "imperative" means "necessary" or "extremely important". The grammar that comes with "imperative" is a little tricky. You say "It is imperative that", and then follow it with a clause that's in a specific tense like this:It's imperative that I speak with him right away.It's imperative that he understand what's at stake.The verb is always in the present tense, and it doesn't change to agree with the subject.
