1 When we arrived at the stadium, the race had started.

a The race was in progress when we arrived at the stadium.

b The race started after we arrived.

2 Louise had done a lot of training when she took part in the tennis competition.

a Louise first did a lot of training and then she took part in the tennis competition.

b Louise did a lot of training at the same time that she took part in the tennis competition.

3 The record company had to pay back all the money to the people that had bought tickets.

a The record company paid the money first and then people bought tickets.

b People first bought tickets and then the record company paid the money.

4 He told everyone that he had won a gold medal.

a He won a gold medal and at the same time told everyone.

b He first won a gold medal and then he told everyone.