Pronouns are the parts of speech we use to describe the gender of people, pets, and sometimes boats and cars (if you’re into that sort of thing). She, he, and -- if you’re non-binary, or genderqueer -- they. If you don’t know someone’s gender, it’s really easy to just use “their/they.” Try it! People do it with babies all the time.
"Your cat is licking their paws.”
"That person with long hair is waiting for their cab.”
"People do it all the time in general," Monika says. "Chicago style manual, Washington Post, and many other style guides recognize it as just plain useful. I have a friend who doesn’t like it for formal writing, but they’re wrong. See what I did there?"