If they had phoned Tom,they would have decide to go the cinema.
If they had decided to go to the cinema,Anna would have got on her bike.
If Anna had got on her bike,she would have fallen off it.
If she had fallen off it,she would have broken her leg.
If she had broken her leg,the doctor would have told her to stay in bed.
If she had stayed in bed ,she would have been bored.