Answer:
Hello There!!
Step-by-step explanation:
Here is your answer:The act of building is when the actual work is in progress.Building is a gerund- a noun made from a verb.Building is called a building even after it's built because there will be lots of changes that keep going everyday in the building like the person who lives in that building keeps growing.It is called a building because it takes anything upto 2 years to construct a house to make it ready and suitable for occupation/people to live there.
hope this helps,have a great day!!
~Pinky~