Раскройте скобки, выбрав правильное грамматическое время:

1. He (to write) books since he was a young man. 2. What you (to do) here since morning? 3. She (to help) her mother since morning. 4. He (to run) for ten minutes without any rest. 5. They (to work) there for three hours already. 6. I (to read) for about an hour when he (to come). 7. He (to teach) at school for five years when the war (to break) out.