There will be 2 other ressonance structures: The first one will follow the fifth pattern, so the pi bonds will move around the ring. The second one will follow the third pattern, so the pi bond that is next to the positive charge will move to the atom that has that charge.
Work Step by Step
1. Draw the lone pairs. 2. Find which pattern does the structures fit. The first structure will follow the fifth pattern, since there is a ring with all atoms having a pi bond. The second one has a pi bond next to a positive charge, so it will follow the third pattern. 3. Draw the arrows: First structure: move all pi bonds around the circle. Second structure: move the pi bond that is next to the positive charge to the atom that has that charge. 4. Do the changes based on the arrows. * Don't forget the formal charges!