Good morning
past continuous (was/were + ving) talks about actions that were in progress in the past.
e.g. She was watching T.V.
present perfect continuous (have/has + been +ving) taks about actions that started in the past and continued up till now.
e.g. She has been watching T.V.
I want to be a doctor. A doctor usually works in a hospital, so he has to wear a medical uniform. This job is humantarian because doctors treat patients. To be a doctor, it is essential to have good university qualifications. I think this job is tiring, but it is satisfying to help patients and see them feel better.
Best wishes
Ola