I do not personally, but sometimes when I don't understand what the teacher was ordered to do, I will ask teachers will come to work later and so won't have to waste time.
My practice is not cheap, but sometimes when I do not understand the teacher ordered to do, I would ask teachers to not have to solve later. And so as not to waste time.
I behave not but sometimes when I don't understand the teacher told me to do, I would ask you to do not have to solve tasks later. And so will not waste time.