Помогите найти инфинитивы в предложениях To reduce the oxygen content some inert gases should be used. 2. It’s easier to prevent a fire than to extinguish it. 3. To use pumps to their maximum efficiency the fire fighter must h...

Помогите найти инфинитивы в предложениях To reduce the oxygen content some inert gases should be used. 2. It’s easier to prevent a fire than to extinguish it. 3. To use pumps to their maximum efficiency the fire fighter must have basic knowledge of hydraulics. 4. To extinguish a fire it is sufficient to reduce the oxygen content below a level that will support combustion. 5. We want him to use foam for causing the fire to go out. 6. Safety measures depend on the value of the object to be protected. 7. Ordinary combustible materials are to be distinguished by water in the form of jets or sprays. 8. A supply of fresh air entering the burning room causes the room to burst into flames. 9. Before extinguishing a fire firefighters should decide which extinguishers to use. 10. A hand pump is used to extinguish a fire.