Dear Alice,
When I really need to go to the bathroom, and we are in the middle of something important, I don't know how to say it without being rude.
Signed,
How Do You Talk Nicely
Dear How Do You Talk Nicely,
First off, try to go to the bathroom before you go to class, at lunch, or during a study hall. If you really can't wait then try asking when the directions are mostly over or flash the peace sign. If you are in a class towards the end of the day before a FLEX block, try and wait until then. If it is an emergency and you can't wait, I am sure that your teacher will understand.
Yours Truly,
Alice