What are you doing?- I am reading and my brother is writing.
What are you reading? - I am reading an English book. I have already been reading it for a half an hour. - I have already been doing the translation for a half an hour. Have you done it? - no. I have done only a half.
What are not you looking at the board? - I am writing English letters.
Are  you listening to me? - Yes and they are listening to you too. We always listen to you attentively.
Look, somebody is opening the door.
Yesterday when I came home my brother was reading a book. He had been reading it for a long time and had read about 50 pages.
When I called Lena she was doing the translation. She had been doing it for a half an hour and had done a half.