Разделите следующие предложения на три категории, содержащие: 1) герундий;2) причастие I; 3) причастие II.
1. Firefighting is the process of extinguishing fires involving three main goals.
2. Extinguishment is reduction of the fully involved areas to a localized fire and
smoldering sections.
3. Confinement is activity directed at limiting the spread of fire.