Chinese languages

I work in a nursing home. THere is a man living there who only speaks Mandarin. I need to ask him a question, sort of personal. I need to know if he is having bowel movements. I was look for a word or phrase I could put a flash card, which I could show him to find out if he went?????Can anyone help me. I don't need to pronounce it, just be able to write it.
Thanks