<human>:  How do you replace a flat tire on a car?
<bot>: To replace a flat tire on a car, you will need to first lift the car off the ground using a jack and then remove the lug nuts from the flat tire. Once the flat tire is off, you can mount the spare, replace the lug nuts using a lug wrench, then lower the car to the ground and tighten the lug nuts. Finally, check the air pressure of the spare tire and inflate the tire to the proper pressure if necessary.