Writing prompt: My Dream

Student essay:
Every one has a dream.My dream is to be a doctor in the future.
Doctors are nice and kind. They devote all their lives to helping patients. They are always dressed in white, so we regard them as White Angels.
It is said that doctors are always tired and busy working in the hospital , but it can't obstruct me in realizing my dream. I'll study harder and read more books about medical science. No matter how difficult, i will never give up my dream. Why do I want to be a doctor?Because I want to save more lives.
I believe my dream can come true,if I study harder.

Corrected essay:
Everyone has a dream. My dream is to be a doctor in the future.
Doctors are nice and kind. They devote all their lives to helping patients. They are always dressed in white, so we regard them as White Angels.
It is said that doctors are always tired and busy working in the hospital, but it can't obstruct me from realizing my dream. I'll study harder and read more books about medical science. No matter how difficult it is, I will never give up my dream. Why do I want to be a doctor? Because I want to save more lives.
I believe my dream can come true if I study harder.