Answer
There are 2 other ressonance structures for this molecule:
In both of the structures, the pi bond will move in the direction of a positive charge.
Work Step by Step
1. Draw the lone pairs.
2. Find which pattern does that structure follows.
In both structures, it will be the third one, a pi bond next to a positive charge.
3. Draw the arrows:
Follow the pattern for a pi bond next to a positive charge.
4. Do the changes based on the arrows.
* Don't forget the formal charges!
5. Repeat from the step number 2, and stop if the structure doesn't follow any pattern.
