(0) Helen plays the piano. She stalled to play the piano last year. Helen has played the piano for a year.
1.  Ben and Jim are friends. They became friends in 2008,
Ben and Jim have been friends since 2008,
2.   Net and Sandra are learning to skate. They started learning to skate last month.
Net and Sandra have learnt to skate for a month
3.  Jack is reading a new book. He started to read it on Saturday. Jack has read a new book since Saturday
4.   Paul likes riding horses. He rode a horse for the first time when he was four.
Paul has ridden a horse since he was four.
5.   Molly is playing football. She began playing football at 5 o'clock. Molly has played football since 5 о' clock.