Complete the general rules.
1. If there is a (kind of) ball involved and it is competitive, you usually use the verb _____, e.g. rugby, football.
2. If you do the sports indoors, then you usually use the verb _____, e.g. gymnastics,
yoga.
3. If the sport is generally played outside, then you usually use the verb _____. Most
of these sports end in -ing, e.g. fishing, horse-riding.