A. Mr Green is very busy. He is running to the office. B. I will be home at five o'clock. C. Sam will go to school at nine o'clock. D. She is in the library now.
A. He is having a hot dog for his lunch. B. It was very cold. I wore my coat when I went to school. C. She played with her cat at home last night. D. It's raining outside. We'd betier take an umbrella(雨伞)．
A. He can read books now. B. My grandmother cooked on a fire many years ago. C. There weren't any aeroplanes two hundred years ago. D. I had an old telephone three years ago.
