Buildings are essential things to human race. Without buildings, it is difficult to survive because we can’t control our own body heat by ourselves outside. If it is cold, we need blankets. If it is hot, we need air conditioners or fans. We use technologies to help us to control our body temperatures. Human beings must therefore need shelters to protect ourselves from disasters, thief's, and the other enemies.

Writing :

We use letters to communicate with other people. Letters make words and words can express people’s minds, opinions and feelings. I think learning the writing is one of the most necessarily thing for humans.

In recent years, we have a lot of convenience technologies to talk and communicate with people who live far from you. For instance, facetime and skype. They are very useful because we can talk whenever we want; however in past, human beings had not invented those technologies yet. Therefore they should have used letters and write sentences to communicate. 

From this fact, we can understand how much writing skill is important for human beings.