You've already learned the basics of Roman Numeral Analysis, but how do you show what you've learned in Music Theory II. 

Seventh Chords

Seventh chords are shown by adding a 7 to the right of the roman numeral.  If they are inverted the inversion symbol is shown instead. 

Cadences and Secondary Dominants

Cadences are also labeled in RNA.  You find the chords within cadence and bracket them on the bottom along with the name of the type of cadence. 

Secondary dominants are written like this:  This means "Five of two."  As in the V chord of the key of the 2nd scale degree.