4, was standing
5, had met
6, was riding
7, was living
8, hadn't wore
9, went, had read
10, was walking
11, went
12, had gone/went
13, was studying/was having
14, were dancing
15, were sitting
EX3
1, After David had gone home, we arrived
2, Before we took a look around the shops, we had lunch
3, When we got out of the office, the light had gone
4, By the time we started our work, she had explained clearly
5, ...
