Present Perfect/present perfect cont. 3) She (be) of great help to us since she (live) for such a long time with us.

1. She has been of great help to us since she has been living for such a long time with us. 2. Have you ever worked as interpreter? — Yes, that is what I have been doing for the last five months. 3. Have they made up their quarrel? — I don\'t know. I only know that they have not been on speaking terms since September. 4. Our pilot has been asking for permission to take off for ten minutes already, but he has got no answer yet. 5. A skilful photographer has been helping me with the development of summer films for two weeks, but we have developed only half of them. 6. I have known them since we met at Ann\'s party. 7. You have opened the door at last. I have been ringing for an hour at least, it seems to me. 8. Look, the typist have been talking all the time, she already has missed several words.