1.There are different kinds of fires.
= Present simple
2. Since fires vary, different kinds of fire extinguishers are used to fight them .
= Present simple
3. When turned side down, it sprays a thick foam that blankets the fire.
= Present simple
4. The soda-acid fire extinguisher is used for Class-A fires.
= Present simple
5. It has a mixture of baking soda and water and a bottle of sulfuric acid