1.Headaches can be very painful and can last for a long time.

2.If you have a headache your head hurts.

3.A sprained ankle can be so painful that you can't walk.

4.Someone with a sprained ankle may need to use crutches to walk.

5.If you have a sore throat, it may be painful to swallow.

6.A sore throat can be caused by viruses or bacteria.

7.A burn is an injury to the skin caused by fire or heat.

8. If you get too close to a fire, you will be burned.

9. An earache is a sharp, dull or burning pain in the ear.

10.Common causes of an earache include an infection, a change in air pressure or water in the ear.

Earaches occur more often among small children than adults.（前文未見生句）

A headache can be caused by an injury to the head.（前文未見生句）