Зелёная колонка: go-going, work-working, meet-meeting, eat-eating, do-doing, look-looking, paint-painting, read-reading, deliver-delivering, repair-repairing, wait-waiting.
Розовая колонка: have-having, practice-practicing, serve-serving, come-coming.
Голубая колонка: swim-swimming.
Это задание на усвоение правил при добавлении окончания -ing- в Present Continuous, обязательно их повтори)