Here's a text message I've just sent to my supervisor, I don't know if it's 100% alright.
Simon, I'll have to ask for a sick leave for tomorrow. I have a fever and serious stomach issues. Today I'll come to work but if it doesn't get better I'll have to take a day off on Friday.
Yesterday I felt pretty bad but I decided to go to work anyway. Then, around 16.00 my condition got much worse and I had to... take sick leave / ask for sick leave / call in sick ? I think the last one isn't OK since I was already at work so I didn't have to call anybody.
First, let's look at a cultural consideration. Assume that the person normally finishes work at 5 pm. In my experience of professional and office jobs, it is unlikely that the person would be required to take a sick day, as the work-day is almost complete. What would happen if he w