If there hadn't been a power cut, the alarm clock would have rung in the morning.
If Greg's alarm clock had rung, he wouldn't have woken up late.
If Grag hadn't woken up late, he wouldn't have missed the bus.
If Grag hadn't missed the bus he would have been on time for an important meeting with a new
client.
If Grag would have been on time for an important meeting with a new
client, his boss hadn't been upset with him.