1. He ran in the school for half an hour (对画线部分提问)
    _______ _______ _______ he run in the school ?
2. We started to skate two hours ago. (对画线部分提问)
    _______ _______ you start to skate?
3. They started to play the piano one or two hours ago. (改为同义句)
    They started to play the piano_______ _______ _______two ago.
4. They have been away from here since two years ago. (改为同义句 )
    ______ ______two years______ they left here.
5. The man began to work four hours  ago. (改为同义句 )
    The man has _______ _______ four hours.