Just add not to make an x-word negative. Most have logical contractions, but 6 are special:
Do family: don’t, doesn’t, didn’t
Modals: can’t, couldn’t, won’t, wouldn’t, shall not, shouldn’t, may not, might not, must not
Have family: haven’t, hasn’t, hadn’t
Be family: am not, isn’t, aren’t, wasn’t, weren’t
Note: This site focuses on the way English is used in the U.S. nowadays. Apologies to anyone who wants to include “shan’t” or “mustn’t” in this list.