1. We will not be able to contact him if he is not in the city.
2. It was obvious that he did not understand what we were talking about.
3. In our study group, there three Japanese, two Germans and one Frenchman.
4. We were still working in the garden when it started to rain.
5. I will have written the letter by the time you get back from work.
6. Do not call me at this time tomorrow. I will be working.
7. He did not have to send a telegram because his parents already knew about his arrival.