op athletes practice their sport. Footballers practice passing, receiving passes, and scoring. And they run and stretch a lot. Tennis players practice serves and shots. And they run and stretch a lot. Champions practice for hours and hours. To learn English, we should train like an athlete. How? We should read a lot.
Tell them that an outbreak is a sudden rise in the appearance of a disease, an epidemic is an outbreak that spreads quickly in a large number of people at the same time, and a pandemic is an epidemic that crosses geographic borders and usually goes global. In other words, a situation goes from bad (outbreak) to worse (epidemic) to the absolute worst (pandemic).