Yes, they may well know what to do, but when they have a supply teacher they will go out of their way to ensure they don't know what to do. Anyone else hate this? I was in a class this afternoon, "finishing off" work and doing whole class work on laptops. The problems were endless! Laptops not charged, files not found, work not saved properly, children fibbing as to whether they'd finished previous work or not (no list from the teacher as to who had finished, had to rely on the children!). In the end, with 20 minutes to go I said they could go on CBBC and play games if they'd finished. I felt like I'd run a marathon. What a crappy lesson to leave for a supply teacher!