Can you proofread the following story?
My dad was sent to hospital. He was diagnosed pneumonia. His doctor said he is already 80 years old and is so weak that any inflammation will be fatal to him. He had to wear an oxygen mask, inhaling 100% oxygen. The doctor said they will not use other ways to prolong his life such as heart and lungs compression if his heart stops since these ways may cause further pain and hurt to the patients. These days, it turns better. He inhales 20% of oxygen and start to eat through a feeding tube. But his doctor said his condition is still critical and family members should have should be prepared themselves as he may leave suddenly.