1 When I looked my watch, I realised what it was too late

When I looked at my watch, I realised I was reading for six hours straight

When I looked at my watch, I realised that Tom had missed the plane

When I looked at my watch, I realised he had been driving to the airport

2 Tom was upset because he forgot his suitcase

Tom was upset because was preparing too long 

Tom was upset because he hadn't arrived to the airport in time

Tom was upset because he had been driving for nothing