1. This man ________ (to be) a writer. He ________ (to write) books. He________ (to write) books since he was a young man. He already________ (to write) eight books.2. What you________ (to do) here since morning? 3. Lena is a very good girl. She always________ (to help) her mother about the house. Today she________ (to help) her mother since morning. They already________ (to wash) the floor and (to dust) the furniture. Now they________ (to cook) dinner together. 4. He________ (to run) now. He (to run) for ten minutes without any rest. 5. What they________ (to do) now? – They ________ (to work) in the reading room. They________ (to work) there for three hours already. 6. Where he________ (to be) now? – He ________ (to be) in the garden. He ________ (to play) volleyball with his friends. They________ (to play) since breakfast time. 7. I ________ (to live) in St. Petersburg. ________ to live) in St. Petersburg since 1990. 8. This is the factory where my father ________ (to work). He________ (to work) here for fifteen years. 9. You________ (to find) your notebook? – No! I still________ (to look) for it for two hours, but ________ (not yet to find) it. 10. You ________ (to play) with a ball for three hours already. Go home and do your homework.

1. is, writes, has been writing, has written. 2. have been doing. 3. helps, has been helping, have washed, have dusted, are cooking. 4. is running, has been running. 5. are doing, are working, have been working. 6. is, is, is playing, have been playing. 7. live, I have been living. 8. is working, has worked, здесь должно быть Have you found, I have been looking for it for two hours, but I haven't found it yet - вот как правильно. 10. are playing. Обрати внимание на то, что во многих предложениях нарушен порядок слов. Не знаю, где это было написано, но много где ошибки. Если это из учебника, то позор таким авторам.