2. Mark has been riding the bicycle since July. He's been riding the bicycle for 2 years.
3. Mark has been playing footbal since 2001. He's been playing footbal for 5 years.
4. неразборчивая картинка
5. Mark has been swimming since October. He's been swimming for a month.
6. Mark has been playing volleyball since Friday. He's been playing volleyball for a week.
7. Mark has been playing the computer games since 10 o'clock this morning. He's been playing the computer games for 2 hours.